those tarps if used rear round last 2-3 years at most. Thought about doing this though - my neighbor sprung for real tire covers.
I may have some old plywood laying around..make a T of wood so the top of the T is behind the tires and the 'leg' comes out between the tires and through a hole in the ply, then drill a hole and drop a long bolt through to hold it. T-111 will last for years w/o paint.
Not something to travel with but the 15 days a year the tires are uncovered is no biggie.
With a few other trailers I have just spray the tires with a UV protectant and hope for the best.
Jill & Chris, Wills (14) Evie (11) & Toby our collie (5)
2011 Grey Wolf 28BH
2013 Chevy K1500 Crew w/ Reese StraitLine Dual Cam
Nights camped 2011: 11 2012: 18 2013: 12 2014: 12 2015: 13 2016: 3