Interesting stop at a Cracker Barrel in Arkansas

He was trying to help you, without making a specific commitment. As in many other situations, unqualified commitments become policy which lends itself to abuse. If he had said yes to someone in a class B who could stay overnight without any problem, then someone with a 45' class A pulling a car trailer could (and probably would) claim that they should be able to overnight also, even though they block the entire parking lot.