Had the same problem, so it is not mud for me. the building we have is 30' wide and 50' long with doors facing on the north side, and the truss run north and south. the problem I had was the doors are 10' tall and with only 1'8" above them there was no way to modify economically to raise the building or lower the ground without destroying the concrete pad. Built another metal shed with the gable facing to the north with the side walls at 14' and metal cathedral trusses east to west, the north gable is 14' off the ground and closed the south to the other building.
As money allows pour a concrete pad the size you need and then save money to build the shed of your dreams, to ass roll up doors you need to build side walls to 15', and make the building 24' wide to store your tow vehicle beside of it. Good travels to you.