I’m able to fit my 9 car in a toy Hauler with 14 feet of space. A 5-16 is about the same size depending on the front bumper and rear cage. My car is 13.5 feet long in total length and I have a little bit of wiggle room on the front and rear.
Shameless plug, I also have a toy hauler for sale if you are looking and it will fit a 5-16. Send me a PM if you’re interested.