Hi, Mikenwis - Wherebouts in Arizona is the trailer located? There ARE a number of RV repair places in the major cities, such as Phoenix, Tucson and maybe Flagstaff. But, there are NO places that specialize in HiLos, as far as I know. The good thing though, is that the kind of damage you are talking about is not unique to HiLos, so any decent repair place should be able to help you.
It is also something you may be able to fix yourself, if you have the skills and energy to do it. There are several threads in this forum about this type of problem and what was done to repair it. You mostly need basic carpentry skills.
DO change your title as Rich suggested, or, if you can't, ask him to do so.
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew