Most commercial campgrounds in our experince allow mobile RV techs, and usually have good recommendations. Most federal, state and city/ county parks will also not have a problem with a mobile RV tech doing work. Last week, a park told me that I could have a mobile tech replace the fan motor in my AC, but could not do the work myself. Guess they want to make sure it is done quickly, without any obvious things taken apart over night. But I won't go back there, so I can't be sure.
I do my resealing and external checks all the time. Never had anyone say anything. I even repack the trailer bearings twice a year. But I have the tools and jacks, and can do both sides of the trailer in less than 30 minutes.
A bigger issue for us seems to be restrictions on washing the trailer, and truck.
I've found mobile techs are superior to taking the rig in for service or repairs. Simply because they don't get paid until the job is done. So they don't take something apart and want you to wait without access to the rig for weeks.
Full-Time 2014 - ????
โNot all who wander are lost.โ
"You were supposed to turn back at the last street."
2012 Ram 2500 Mega Cab
2014 Flagstaff 832IKBS TT