Hi, my garage entrance is about 6.5 feet in height. I can fit a trailer that is up to 17 feet long. My garage restrictions seem to relegate me to a hard-shell popup, like an Aliner. The problem is the Aliners that would fit in my garage only sleep 3. Along with my wife, I have 2 teenage boys. My main concern is comfortable sleeping arrangements. Do I have any options other than a canvas popup? Thanks. Dave