Sorry, but I just don't see the issue here ... regardless of whether we're talking about a trailer with a rear glide or not any of these site dimensions that I've seen are intended only as a general guide and are intended to give you an approximate idea as to how much room is available to park a trailer, whatever it may be. In the many years we've been camping here in Canada and in many parts of the US about the only limitation we've run into has been the rare circumstance when there's been a large tree or boulder located right at the rear of the pad where the trailer would be parked and would therefore predetermine where the tongue would sit, but that's been a rare occurrence. Even with our previous KZ Spree which measured 26' 9" coupler to bumper I never had any difficulties locating on sites described as for "small trailers". Our current trailer measures 22' 6" coupler to bumper and when selecting a site always look at the largest numbers of sites available by selecting "trailers 18' or less", knowing that about the only site I can't get on is a terraced tent site, for obvious reasons. JMO but this is much ado about nothing until you're in the 30'+ range when you probably should then give some thought to trailer length vs site size, otherwise in my experience it's a concern over nothing.
