GDE and SD, I’m pretty confused.
GDE, literally most every 7’ wide cargo trailer out there is a low deck height with outboard wheels, flat floor. Unless you specifically get an inline trailer, but those generally aren’t in the small single axle size.
SD, aside from a 7’ wide being about 9” wider interior width than you’re building, everything else you are proposing is basically standard trailer features.
Single 3500lb axle with brakes. Yup
Low deck height. Yup
Available in taller heights. Yup.
Rear drive up ramp door. Yup.
Like I said, nice project, but there are trailers available that for all intents meet your criteria. I bought one a couple years ago, basically exactly what you’re proposing except I opted for 14’ long. Was about $3200 out the door, delivered 100 miles to me ($150 fee but I was in a time crunch). Ordered in any ( basic) color I wanted. Engineered waterproof wood floor. Full plywood walls. 3500lb axle with brakes.
MTI trailers.
Maybe they’re the only ones that make this type of trailer..... but I doubt it.
