I have three 10’ doors with a suburban and 3/4 ton pickup. I would definitely NEVER have a narrower door. I thought it would be plenty of room, it’s ENOUGH, but not plenty. Still have to watch the mirrors on way in and out. If I could, I’d prefer 11’ or more. I can’t see how an 18’ would work COMFORTABLY with two large vehicles. Depends on in if you want it to be doable or be comfortable/easy.
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