Florida state parks B class in tent sites

Hi all! Although I don't post very much, I do visit this site often and have learned so much in the time I've had my Roadtrek. Finally we are able to spend some longer time time enjoying "Arvie" and are heading to Florida for a couple of months this winter.

I notice, in particular in Long Key State Park there are a few sites designated as tent, but it does say van allowed, with a maximum length of 15 ft. With a car or truck you are allowed 2 tents. In looking at the photos posted on the park web site it does not look like there would be any problem in parking the van there.

My question is this. The Roadtrek is 19 ft long. Does anyone have experience with booking one of these tents sites with a van that is slightly longer than the 15ft max listed on the booking site?

Thanks very much!