First, you have to determine the loaded weight of your motorhome which has a GVWR of 9,600 lbs. Include the hitch tongue weight of the loaded trailer in that calculation. Then, you subtract that weight from the GCWR of 16,000 lbs. to determine the maximum amount of weight you can haul in a trailer and its load. The specs I found for the 2003 Roadtrek Popular indicate a maximum towing capacity of 8,400 lbs. not 10,000 lbs.
2013 LTV Unity MB Theater Seats
635 watts solar panels, 440 AH batteries, BlueSky Solar Boost 3024iL & IPN-Pro Remote, Magnum MS2000 & ME-RC50 remote
Koni Shocks F & R, Hellwig 7254, SumoSprings F & R
2012 Hyundai Accent SE, Blue Ox Aladdin/Patriot