Took out our "new to us" 97 Jayco Eagle 303rk this weekend. Had the water topped off w/ 56 gal. water (at the very back of the rig), full propane in the pass. front, all the holding tanks empty, new tires (same as old tires) aired to within 2 lbs on truck and trailer, about 4 inches clearence on bed rails, pulling w/ 2001 Chevy hd 2500, (same truck as I pulled old trailer with, Reese 15k hitch mounted 2 in in front of axel.
got up to about 50-55 mph and it felt like the trailer was whipping. Stopped and checked everything, looking good. got back up to about 50 started feeling it again, thought it might be wind, went around some curves still doing it changing wind direction, increased speed to about 60-65, still the same but not worse.
Pulled the rig home w/ about 20 gal water in tank, still feel it but not as bad. got home got the tape measure out and measured everthing under the trailer, everything equal on the measurements, did find that the passenger side brakes have never been hooked up, (no wire to the hubs and the little wire caps are still on the hub wires), they will be hooked up tommorrow.
Any ideas as to what my problem is of am I just feeling something that is not there. any ideas would help, got a elk hunt in 2 weeks and this is my camp, 450 miles one way