One suggestion to add: if you’re re in the snow states, get a curved roof. Reduces the chance of standing water during thaw/freeze cycles.

I have a curved roof 20’, 10k axles, winch, etrac and D-ring equipped trailer. Have two roof vents which I believe are worth having to allow balancing of interior vs exterior temps- a good thing to consider if using it for storage, besides transport. A street door and an extra 4’ would be nice, but this unit was the best deal I could find when was needing something and don’t regret it one bit.