My spare is under the rear of the unit. Tire valve is on the bottom, where you can get to it without lowering the wheel. Checking the pressure, even though I have to crawl under the trailer, is on my mandatory list, each and every time we take the trailer out. I also carry a portable air tank in the truck box every trip.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.