Hauling a smart car in toy hauler fifth wheel

If you put all that in your TH, then the Smart should be no problem. I think the Smart is about 8'9" long and about 5' wide. I have a 12' garage and I have a lot of space to move around with it inside. I'm 6'3" tall and I drive it in the middle of the garage and have enough room to get in & out without the door rubbing the wall.
Not knowing the size of your sand rail, I would guess the Smart is a lot smaller.