I built my shed primarily to house my motorhome but also wanted it to serve as a workshop. Mine is 30' x 50' with 14' sidewalls, insulated but not heated,, the door is a 14' x 12' roll-up and I had the drive poured 16' wide. I have full hook-up so I can thoroughly clean the holding tanks when we return from a trip and we also use the motorhome as an extra bedroom when needed. The one thing I had to change after the build was completed, I had to upgrade the electric hook-up from 30amp to 50amp. I would suggest going with 50amp initially and use a pigtail if you only need 30amp. Other than that MINOR problem I have been extremely pleased with my building. Would like to add a picture but don't know how, sorry.
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