Also, with a 5th, it is very hard to move the percentage very much. You'd have to be carrying lead or gold bars (or livestock) in the bedroom or on the bumper. You can get the total weight up a lot, but getting it distributed so that it has a greater or lesser proportion on the pin is pretty hard. My water tank is in the rear, so I usually travel with full water just to help with pin weight. It doesn't get me much. But since I am close to the line, I figure every little bit helps.
2012 Ford F-150 Eco, Max/Max
Jayco 26.5 RLS, Reese Sidewinder