I have a very good friend that is a retired Captain of the PA State Police. When I first got my RV I asked him this very same question. In PA since everything is for personal use I do not need to stop. If I had a company name, (I have a little side business for model trains) then that COULD make it commerical. When I asked about other states he advised that I research the states I travel through just to be safe. His last bit of advice was You are much better getting waved through a checkpoint then having them chase you down and stop you!
2013 2500HD Chevy LTZ 6.6 Diesel Ext Cab Long Bed
2017 Grand Design Reflection 27RL 5th Wheel
Dear Wife, plus two Cocker Spaniels and a Standard Poodle