SemiTractor towing RV/ Camper

You are still a cmv, so you must follow all cmv rules. Yes to weigh stations that want all cmv's and by weight.
The not for hire is a useless sign that means nothing and might even get you pulled in to verify personal use.

 

Or you could be hauling RV's for a living transporting to dealerships. Not saying you are, but dot catches a fair few trying to haul rv's and running non-commercial.
That said I would make sure you have a copy of your rv registration in your name just in case.

 

I like a green light from a Prepass.

 

Covering up the DOT number doesn't magically turn it into a non-comercial vehicle...

Even if your using it to take the boat out to the lake for a personal trip.

 

Why would you have a prepass on a personal vehicle? Prepass is made for commercial vehicles. If the plates are commercial, yes you must stop, not for hire means nothing. If the plates are personal, as in RV, then I would think its up to the jurisdiction the weight station is in. You don' see RV's entering the weight station for a reason.

 

The only thing covering your numbers is going to do is get you a whole heap of hurt if you get pulled over. As mentioned, it is still a CMV and you still have to abide by all the regulations.

 

Typically those Trucks that pull motor homes are registered as motor homes themselves and not commercial vehicles There's an entire niche community around that very thing.