Find the original brochure for the unit you are looking at, generally I find them with just a little searching on Google. Here is an example.
1996 Lance Truck Camper Brochure
Page 13, top left. "Wired for Air Conditioner" and it shows that is applicable to all models in the list, (Lance, Squire, Squire Lite).
Find someone with a Bigfoot trailer who wants to upsize their A/C and buy it from them, as 11k is all BF installs in everything. Some people now order without A/C and install their own to get a larger, heat pump unit. My 21 ft has a 11K Dometic Penguin (low profile).
Charles