Just wanted to share some information that I was searching for before I purchased my 18lt but was unable to find.
The 18lt will fit a 4 seater Polaris razor rzr4.
I have the flip down beds in my trailer (not the couches). These beds have a couple cross members That go across the roof an hang down a bit below the ac unit.
I have a little bit more than an inch of clearance on either end of the razor.