Good job on getting the tires out of the grass/dirt for long term storage.
I agree with the others, for overwinter storage leave the stabilizers up. These campers frames can bend easier then one thinks. The suspension can handle the weight.
I agree to make sure you have full tire pressure at the side wall cold pressure.
Something to consider if you plan to keep the camper a good long time or even a few years, cover the tires with a light/white tire covers. The UV sun damage on the tires is for sure there. Consider getting a breathable camper cover and read up on how to add extra rip protection for hard sharp covers before putting it on. Having the camper under cover/covered will make it last a lot longer from less sun damage to the plastics/vinyl/roof and help stop leaks starting in degrading sealants on the roof and siding.
Happy camping come next season.
John
2005 Ford F350 Super Duty, 4x4; 6.8L V10 with 4.10 RA, 21,000 GCWR, 11,000 GVWR, upgraded 2 1/2" Towbeast Receiver. Hitched with a 1,700# Reese HP WD, HP Dual Cam to a 2004 Sunline Solaris T310R travel trailer.