Rats aren't slow... I don't know if it was in response to anything above, but a while back, a couple of the Universities here in Oz got together to study rodents reaction to various deterrents and their habits generally in a bit more detail, and while it wasn't initially one of their tests, they discovered that it didn't really seem to matter matter
WHAT 'deterrent' was '
applied'
once a day instead of
once a week.
IIRC, they tried all sorts of 'supposedly attractive baits and deterrent' type stuff; amongst a range of other baits, they tried peppermint, tea-tree oil, eucalyptus, even water...

The initial results showed that rats appeared less frequently at those sites/test stations where the testers &/or humans appeared most often/more frequently than 'once a week'. So once that became clear, they decided to look into this a little deeper, and eventually they concluded that regardless of the 'attractiveness of the bait' or the 'unattractiveness of the deterrents', rats simply tended to 'visit' those sites where humans/testers appeared daily far less often than the rats appeared at any sites where the testers visited less frequently &/or regardless of the bait or deterrent, even at those testing stations/sites where the testers
did NOTHING AT ALL except VISIT, simply 'visiting and then leaving', applying & doing NOTHING AT ALL except going there!!
SMART RATS - 1
HUMAN's &/or TESTER's - 0
So, it seems that the cheapest and most effective 'rodent damage deterrent' for your Spyder is to visit it at least once a day....
To stay on topic to start, I've never considered if I should be leaving the parking brake on or off during storage. I've left my RV's parking brake on in storage for months, but rarely is my Spyder out of commission for that long here in Arizona. I see the logic of leaving it off to reduce possible stretch, but what we think happens isn't always what will happen.
Re: Peter's post.... It's accurate info that I'd like to back up. Read on if your are interested, or skip to the next post if your are not.
I was certified, and did institutional pest control for over 15 years, and was required to attend annual recert classes to keep my license valid. I took care of multiple facilities with kitchens, cafeterias, recycle centers, and food storage warehouses. If you think your Spyder is attractive to rodents, imaging a warehouse full of sacks of flour beans, rice, boxed mayonnaise, raisins, etc, not to mention a kitchen that prepared meals for 300-1500 people 5 days a week. Some of our buildings dated back to the 1920s. Rodents were a regular topic, and we had talks by researchers each year, and they all said the same thing: There's no such thing as a effective repellent. They showed slides of Mice calmly sitting next to a ultasonic "pest chaser"; bars of Irish Spring soap partly consumed by rodents; a mouse sleeping in a bed of shredded drier sheets; videos of rodents walking right over rope lights; etc. Oh, one test did show that cat urine will reduce rat visits by 30%, as did some aromatic substances in small enclosed spaces,
when applied daily as mentioned in Peter's post. That means they still visit 70% of the time. I'm sure everyone would agree that even that isn't a good solution. The reason daily application is needed for any effect is; these substances volitalize very quickly. The other reason is covered below - adaptation. Remember, something may be marketed as a repellent if it simply reduces pest visits like the cat urine did. Technically that's repelling the pest. But this is not how people think of a repellent when they imagine them, they think they
stop visits. At least that's what one
wants in a repellent. To
keep pests away.
When doing online research, you'll almost never get a hit on a search engine to actual objective test data. Search engines like Google will return hits based on how common a post subject is, and because there's way more personal testimony on dealing with pests than actual research data, bad info gets passed on over and over again, which re-enforces the search hits and how close to the top of the search page they are. The more you read something works, the more you believe it does, even if it doesn't. A popular subject gets more clicks than a boring data driven article. I see this with other subjects I have extensive knowledge in. I've seen countless articles by so called "experts" that are simply writers repeating what they've read online, and what they might believe works. I heard them all in my job. My favorite was being told for the 100th time that feeding corn meal to ants kills them because they can't digest it, they swell up, and they'll explode internally. One tiny problem was that when I explained why this isn't true, I was usually met with blank stares.
Adult ants don't eat solids. They take the solid food back to the nest, where they feed it to the grubs, which then produce a nutritious liquid that the adults eat, and which is fed to the queen. Dumping a pile of cornmeal near an ant nest only appears to work because it can stop them from foraging because you've filled their pantry. You no longer see the line of ants, so you believe it works because the corn meal killed them; when they are instead, happy and working to expand the nest for the next cycle of foraging. This is a perfect example of bad info being repeated.
There's huge amount of observer's and confirmation bias in personal testimony, even when the poster is sincere, which I believe most people are. I'll use a real example offered to me as sincere advice by a neighbor, who wasn't aware of what I did for a living before retiring. We live at the edge of thousands of acres of Arizona BLM land, have high numbers of stored RVs and vehicles of all types, and few actual garages. This land is home to the pesky Wood Rat, commonly known as a Pack Rat, along with the Pocket Mouse, House Mouse, and Kangaroo rat; but Pack Rats are all anyone knows and talks about. He said that he stored his RV outside next to the house for 10 years without a problem, but then had some damage caused by packrats, so he put lights under the RV, and hasn't had a problem since, and it's been
2 years - Proof the lights work. Do you see the fault in his logic? The conformation bias in his conclusion? I did instantly - No lights worked for 10 years, and lights for 2, yet he concluded lights are the solution, and that's what he tells everyone. Based on his own real data, he should be telling people Pack Rats are afraid of the dark, and that no lights is the preferred method of control. According to his own data at the time - no lights is
5X as effective as lights. I've lived on a rural property for almost 40 years, never use lights or repellent, only the proven pest control methods listed below, and have never had any of my vehicles damaged even by the dreaded Pack Rat. I have gone through a lot of bait and trapped many rodents, mostly Packrats. I use an electronic rat zapper, checked regularly, and throw the dead bodies out in the yard. I have a nice big happy Roadrunner that visits my yard and appreciates the free meals.
In pest control the three SOP steps are 1. Exclusion (the most important) 2. Bait (externally) - to reduce local population, which in the industry is known as reducing past pressure. High pest pressure is a large population competing for limited recourses. This drives pests out of their natural habitat into ours. 3. Traps for monitoring. At best, everything else may offer limited and usually transient control. Without getting too deep into the scientific weeds, we tend to apply human logic to wild animal survival behavior. We think that because we avoid unpleasant sights and smells rodents will too. Two things go against this logic - one is the word
survival. They must work to survive 24/7/365. I tell people pests are pros. They are better trained experts than I am, and certainly than the average home and vehicle owner. The other mistake we commonly make is we think of them as passive, creatures with tiny brains, not as intelligent survivalists that constantly test, and evaluate their environment, and
LEARN what is dangerous, and what is not. Light might give a rodent pause when first encountered, but their little survivalist brains will quickly learn the lights pose absolutely no threat and can be
ignored. The scientific word for this is "adaptation." All creature's brains, ours included, are designed to adapt, and to be ready for new and novel threats. In order to do so, common, repeated stimuli, fade into the background which makes room for attention to be ready for a new threat. This goes not only for sights, but for smells too.
My advice is this: use repellents if you like, but don't ignore proven methods listed above. You won't find lights, Irish Spring soap, drier sheets, and peppermint oil on your local pest control person's truck for a reason. The way I equate using repellents in place of proven methods is like you going off on vacation, leaving a light on in the house to deter burglars, but leaving the front and back doors not only unlocked, but wide open. We wouldn't think for a minute to do so to keep our homes safe, but we regularly do it to keep our vehicles safe from pests. We leave the the doors wide open and rely on a repellent to stop the professional intruder.
Ok, pest control lecture mode off. Now what were we talking about before some kooky guy hijacked the thread???