I worked for years in the retail and contractor home center business. The company I worked for also manufactured wood roof and floor trusses. These trusses were supplied for regular homes, commercial buildings, municipal buildings, large apartment complexes etc. Each truss is designed for an intended load with specified bracing points to make the truss system work as one unit. If a truss is not designed for a specific load to be hanging from it, then you are taking a real chance at a failure of the entire roof . When a roof truss has a load on it, ex: snow, the webs in those trusses push down against the bottom cord and then back up to the top to balance or absorb the load. Hanging something not planned for on the bottom chord could cause failure of the entire system because if the plates on one truss becomes comprised, it can affect all the trusses.
Our TC does not require a registration...so our truck has the only plate.
In Yellowstone, there were many side roads that restricted RV's...I started to enter one (it was a tight/twisty road) the Ranger just waved...after that we drove on any road we wanted and were never questioned. OTH, we parked in "RV' spots at many NP's...so the TC was the best of both worlds. I actually felt bad (not TOO bad) for the difficulty Folks in Class A/C's had trying to find parking in the NP's. The TC was so easy...we could fit anywhere.
Twice we have pulled into to State beaches here on the East Coast, that said "No RV's", the attendants never batted an eye...they charged us the automobile rate and in we went.
We have camped in "tent sites" at NP's, NF's, etc with the Rangers permission, if there were no RV sites. We take only 1 parking space, same as a tent camper...
As noted, I guess it depends who is posting the signs and why. If you are not registered as an RV, you could always point that out to who ever asks.
Ask nice, explain you only need a single space. We have never had a problem.
p.s. we even squeezed through here;
Can anyone guess the location?
Yup ! Real easy ... you're in that famous hole in the wall place under that giant boulder. My brain is starting to fade so I can't remember which state it's in, but I think I have it narrowed down to the lower 48. That makes me the closest without going over. When do I get my prize ?
So the answer to your question is "yes," but it's worse than you know. The only way I know to counteract that energy field is to present your rig as the most terrifying spot on the 500 acre field. Fly a giant skull & crossbones pirate flag, or a confederate flag, scatter empty beer cans liberally around, fire a shotgun wildly in the air when you see 'em comin', and chase your SO, around the RV several laps, both of you nearly naked and screaming at the top of your lungs. And if you can have 3 or 4 pitbulls barking loudly in the scrum, that will help, too.
You'd better be careful ! A spectacle like that might seem real inviting to some of us Redneck Truck Camper people ! Just like being at home..... we'll even bring Cousin Eddie with us !
How much snow do you have on it ? If it is a large amount, ( in excess of 6 " ) ,you might consider adding airbags to support the added weight, or sumos, or timbrens, or supersprings, or extra leafs etc. ( don't forget to check the shocks also !)
Glad I was able to help, if you need further assistance I would recommend doing a search for snow weight on a dually , lots of good answers available.