Granted I don't live there, but I've been through northern (I-90) and southern (I-84/15) Idaho fully loaded. I've got nothing but upper Stableloads and they work great. Simple concept, and won't leak or pop like airbags.
I'll be heading to northern ID in June from Seattle. Day's trip, but always fun through Ellensburg where the side winds have make for a white-knuckle ride.
'15 F450, 30k Superhitch, 48" Supertruss, 19.5's, Torklift Fast Guns
'12 Eagle Cap 1160, 800watts solar, Tristar MPPT, Magnum Hybrid 3k Inverter
'15 Wells Cargo 24' Race Trailer, 600 watts Solar, TriStar MPPT, Xantrex 2kw inverter
'17 Can Am X3 XDS Turbo