National parks for long 5ers?

Not sure where you're getting your information but my 34 footer has only ONCE found a national park campground that would not let us in due to length. That one place was Mt Rainier national park which limits length to 28 feet (for some reason) but not knowing this I took a tour of the entire campground, selected a site that left about 20 feet extra length and backed in. when I'd finished setting up and went to pay, I was told my trailer was too long and I'd have to leave. When I asked why they said it was not possible to get a trailer that long into the campground :H It wasn't hard getting in and it wasn't hard getting out so SOMEONE is nuts. Other than that one instance we've never had an issue camping at National Parks all over the nation. Where it's worked for us
Yellowstone - Glacier - Grand Tetons - Olympic - Rockey Mountain - Grand Canyon - Smokey Mountain - Shenandoah - Acadia - Sand Dunes (Colorado) - Messa Verde - Zion - Flaming Gorge - a lot of others.