On my first trip to Clinton I weighted about 210 and my passenger was about 220. back of the 152 was loaded with enough luggage for 5 days each and 2 sleeping bags, 2 cameras, bottled water, a tent and we always topped off our fuel.
I bet we must have been 1 or 2 lbs under gross

and never had any problems.
I used to weigh 247 before I went on a diet but still had no trouble.