OP says:
Honestly, if I towed the range rover, the bulk of the show stuff could stay in the back, unload by dolly, couple of boxes of inventory to transfer, nothing is totally unmanageable or unwieldy.
But in previous posts, he states that is product has to be kept cool, and later asks if the AC could be run in a TH while on the road. Seems to me that your product needs to be cool - the temp you state that it turns to garbage was 110 and that is easily obtained in a closed vehicle. I don't know how cool it stays in a MH while traveling but it would not be 110 inside.
Maybe the stuff talked about in the quote above is not the inventory, but stuff like tents/display tables, etc.
If the stuff that needs to be kept cool can be put in the TH refridgerator, you could consider that. You can run it while traveling. You could also consider getting a high end cooler like a Yeti, or carry the must be kept cool stuf in the truck cab's back seat.
