Never towed a trailer, but I moved a lot of retail fixtures and stock with the company Transit when we had one. With every bit of volume packed and cargo spilling into the passenger seat, it wouldn't ever feel like it was struggling.
A lot of wasted space, however. You're building it out, so the fact that the trim
was as garbage as any othr modern vehicle is not a matter.
The most annoying thing is that the lumber and ladders I can fit in my sedan
could never fit in a stock Transit. 🤔