Found a company to build what I wanted. Husky Cargo out of Fitzgerald, GA sells direct to the public.
This is a 40' gooseneck with 32' of deck, slight dovetail and 7000# Dexter axles. 96" wide rear door was a custom option they had never done before.
Screwless exterior, one piece aluminum roof, 1"x1.5" square tubing in the roof and walls. Reinforced ramp and all LED lighting. 12 D rings in the floor bolted through to steel underneath.
Quality seems to be quite good for the price. Welds look decent. Pulls great empty. Weighs 5,900 lbs.
Options I should have gotten in hindsight: electric front jacks, 12" additional height, and radial tires.
The big bitch just fits, but it fits. Theres room for two buggies and an ATV easily. Was $16,500 out the door. This company received some bad reviews from folks who didn't understand that they're a factory, not a dealership. So you have to go in knowing that you're going to give them a big down payment and not hear a peep until it's done (8 weeks in my case, normally 6 for standard trailers). I had no issues at all.