No, you are not a truck. However, if you are towing something behind your MH, many states require that you obey truck limits. Some states, like California, try to spell it out with signs like ALL vehicles towing, speed limit 55 mph. Obey it. For some reason, RVers think the laws don't apply to them until they get a ticket.
Be sure to look at the speed laws for each state you are going through and if you are towing, make sure you are in compliance. By checking the laws before you leave, you should not have a problem. Good traveling!
Lee
2001 36' Kountry Star DP