Ed, are you confident that it is the motor that is going bad, and not anything kinking in the arms? I'm just throwing ideas out there, that may be easy to fix,
I did have one of my power stabilizer motors go bad, from where water was getting into it.
Lippert power stabilizer full of water
As I stated in the forum post above, it probably wouldn't have been the best scene, if I had taken the trailer back to the dealer 90 miles away, than have them tell me it was unwarrantable because it had water in the motor......which was caused (IMHO) by faulty installation at the factory.
Of course, this is all supposition on my part, and they may have took care of it, no problem (although highly doubtful). Luckily, I was able to fix it myself.
Being just across the Big Muddy from you, and sharing the same temperatures, I'm concerned about what you said that you couldn't get the trailer to cool off no better than 80-87 degrees inside. Do you have any tree cover, where you are parked at?