Haven't picked it up yet, I'll have to looktomorrow at PDI. I know the A/C is 15K but couldn't find any info on the furnace. It's a 32'er and ducted so I would think it would be larger than normal.
Inside the kitchen door on the spec sheet it will say what model furnace you have. I have an Attwood 8525-IV that produces 25,000 BTU. They have larger ones.
This is actually documentation from Atwood about the furnace. Your spec sheet will be inside the kitchen cabinet door listing all the items in your TT.