Are we considered "trucks" on the road?

in Washington they have a different out look on tow vehicles and towing TT's. they think you are a truck and are required to drive the truck speed limit. my SIL found out the hard way. So my answer is depends on the state you are driving in. more research is needed for a definite answer. even delivery trucks fall into that category so if your MH weights in at a certain weight, you may be required to drop your speed.