We've been 15k miles in our bus in a year, coast to coast. Never once stopped at any weigh stations or checkpoints. Never had an issue.
My build thread:http://www.skoolie.net/forums/f11/build-thread-for-haulin-oats-and-goats-11237.html#post113500
A gal, a guy, three cats, two dogs, one rabbit, and one goat, traveling the country together.