Congratulations with your creative build, and good luck with the business. I've been considering similar designs, and weighing the merits of these, against a more normal teardrop (but maybe a more "industrial" design).
How does the RTT work out for you and your customers. Dealing with the ladder was one consideration I still haven't quite resolved myself, preferring (I think) more of a step up/in design, like what you'd have with a Lifetime/Jumping Jack style trailer, but with the storage/facilities like you have put together.
Again, good luck with the business!
