Never had that problem with either Class A I've owned, but did have that issue with a Jeep Wrangler.
In that case, the flexible fill hose, between the fill port, and the tank, has a tip over valve inside. It's a butterfly valve that's intended to shut the fuel hose off if the vehicle rolls over.
But mine was made of plastic, and eventually failed in the mostly closed position. Would only take fuel slowly, and kept "burping" gas. Major PITA.
I couldn't source the part from Chrysler, but someone on a forum found a direct replacement part from GM:
https://amzn.to/2UZyJOKThe swap wasn't difficult and completely solved the issue. Good luck with your gremlin!