Larger 5th wheels in/on state and federal parks

My trailer is 41' long and maxes at 19,000. It's been all over the country in the past 6 years with no problems. We've never been anywhere we've had to turn around. Some places have been rather tight but navigable through superior driving skills.

We've never camped in a national park because that's not our thing. As far as state parks we've found that AZ parks are huge and have more than enuf room for the largest of rigs.