TB, hello. I bought from them last year and would do it again. I am sure you will love it.
Right now, tell them to stage your unit for the PDI on concrete. This place looks like an artillery range when it rains, complete with small ponds.
Before signing, and with an LP tank filled before you get there; let them help you add some water to the FW tank; hook up electric and city water. Fill the HW and heat it with electric and gas, check out every minute detail; every system, including every button and switch. Every door, every window, e-v-e-r-y-t-h-i-n-g.
Look over everything they want you to sign, carefully. They wanted more money when I got there and what I had given them, wasn't reflected on the contract, probably an honest mistake, but be careful.
If you can spare the time, camp at the lake near there to really get to see it work.
Make sure tires are at 65psi cold and the lugs are torqued; take along a torque wrench and check at 50, then at every 100 miles up to about 500/600. I was surprised that each time they would tighten. I also added the red high temp bearing grease with the buddy hubs, but shoot it in slowly, until you see it begin to exit the bearings. It might take more than one tube for all 4.
If you get home in 16 hours you are probably driving too fast. If you haven't pulled this kind of weight, length and height behind a light truck, allow plenty of stopping distance and be especially careful through Atlanta!
Let us know how it goes. And remember a post without pictures is really no post at all