The FIRST thing you need to figure out is whether or not your truck bed (or trailer bed) has a large enough FLAT surface on which to carry your Spyder. It needs to be AT LEAST several inches wider than the width of your front fenders so that you don't scrape the sides, and AT LEAST a foot or so longer than the longest measurement of your bike so that you won't rub at the ends. Of course, it helps to have even more than this so that you can move around when attaching tie-downs, which also need space to stretch out in front of and behind the Spyder. You DO need to use tie-downs to be safe; if you don't, the Spyder will move around and 'creep' as you drive down the road. You don't want loose cargo shifting around as you travel. Point #1, if your bed isn't large enough, it ain't gonna work.
SECOND consideration is to measure how high your truck or trailer bed is above the ground. At around 12" to 15", you need ramps approximately 5' to 6' long in order for the Spyder not to BOTTOM OUT when you transition from top of ramp to truck bed. If your ramps are too short, you will be in danger of getting 'hung up' or damaging the bottom side. If your truck bed is 25" or 30" above the road, you'll need a pretty long set of ramps (three in all; one to take care of each wheel). Someone can help you do the exact mathematics; I'm out of practice on my geometry at the moment. You can reduce the length needed, sometimes even do away with ramps somewhat, if you load from a loading dock, or perhaps back your truck into a ditch or up against some higher ground, effectively lessening the 'rise' between the ground and lip of your truck bed; however, you may not have the same situation at your arrival point as when you loaded, and could then wind up having to search for a similar piece of ground. So, better to have the proper ramps with you.
I believe the above just sets out a bit more graphically what Mike and others were explaining above. Getting the right ramp length is mathematical; many of us find it by 'trial and error'. Just try not to 'ground out' during the learning process. In this case, longer is safer; but make sure your ramps are well supported and strong enough to carry the 1000# weight you're trying to load. Good luck.