Tires should be fine, may just need some air....I would go to Lowe's and buy ''stepping stones'' for the tires to set on.
I have a gravel lot where I have my carport where I keep my TC & pontoon... I also have my TT & equipment trailer in the gravel lot too... I have the stepping stones under my TT, pontoon & equipment trailer tires!
I don't let the tires set on the gravels because the #57 gravels are sharp.... I bought the 12"x12" stepping stones and they're perfect for tires!
John 3:16
1996 Hide Away Sun Lite Truck Camper
2003 31' Salem LE Forest River Travel Trailer
2013 Sun Tracker Bass Buggy 18 DLX Pontoon
2002 F-150 SuperCab V-8 4X4
Firestone Air Bags
Homemade Tie Down Mounts
Equal-i-zer WD Hitch