Trying to figure out the best way to get to the rear tire valve stem, I bought a floor jack that is low enough to slide under the Spyder, but despite some advice as to where to place the jack, the rear end is low enough to the ground that I could not see where to put even when lying flat on the ground next to the bike. I plan on stopping by the CanAm dealer once the weather is nice enough to go for a ride, and ask them to show me where the best spot would be to place the jack.
In the meantime, I found what works for me. I left the parking brake off, laid down next to the bike on the left side, and while lying down pushed the bike (not hard even at over 1,000 pounds) until the valve stem was at the bottom of the wheel (six oclock). Then I attached an extension to the valve stem, which then made it easy to hook to my electric air pump. Once it was pumped up, I screwed the FOBO2 TPMS piece onto the extension for an easy read of the tire pressure. Once I had it to where I wanted (30 psi, which meant I had to bleed a bit of air out even though I had set the air pump at 30), I removed the extension and screwed the FOBO2 sensor back on. This process meant that I only had to lay down on the ground once for the entire thing, and at my age, not having to get up off the ground more than once made the whole job a lot more tolerable.
With a brand new rear tire on the bike, and with the psi at 30, I hope to go an entire riding season with only using the TPMS to monitor the air pressure in the rear tire. As long as it does not get down below about 25 I will be fine so even with some leakage over time I should be ok. Front tires are, of course, no problem even for an old codger like me with a bad back, damaged shoulders, and artificial knees.