Welcome to the real world. If you are a lco, look like a lco, or have logos on your truck and crossing state borders they can stop you for no reason if you are over 10,001 gvwr. Not loaded weight, just capeable weight. It doesn't matter what plate you have on the truck, if they pull you over and you are doing business over boaders they can and will ticket you.
The travel trailer is bs unless its their state law. If you get pulled over in your truck and using it for personal use just say that and they need to let you go (unless they had a reason to pull you over besides being a commerical vehicle, ei light bulb out). If been pulled over headed to my parents with a trailer and got me going without and bs.