Originally Posted by bagpipes
Reports I've read seem to indicate that the 12000 bars are too rigid for a lighter trailer and don't flex properly when meeting with bumps and dips such as entering a driveway, fuel station, speed bumps, pot holes etc.
Makes sense. My only personal experience is with a Reese Strait-Line hitch with 800-pound trunnion bars, dragging an "ultralight" travel trailer with 500 to 650 pounds tongue weight. It handles great, and no problems over dips and bumps, and no bent RV or TV frames. So that's an actual tongue weight of 62.5% to 81.25% of the hitch's tongue weight capacity. I suspect as little as around 60% would be fine, but maybe less than 60% of capacity would result in the problems you mentioned.
A hitch with 1500 pounds tongue weight rating with 900 pounds actual tongue weight would be loaded to 60 percent capacity (900 divided by 1500 = 60%). So I suspect Cjnfamily would be okay with that hitch when towing their TT if the tongue weight were 900 pounds or more. Backing off to a 1200 pounds spring bar rating would result in the hitch being loaded to 75% of capacity. I'm almost certain that 75% would work great with none of the problems you mentioned.
Replacement round spring bars for a Reese/Drawtite hitch would cost Cjnfamily about $160 from ETrailer.com . Or replacement trunion bars for the better Reese/Drawtite WD hitches would cost about $220. He can decide if the cost is worth the risk of bent frames using the heaver spring bars.
Replacement Round Spring Bar for Reese Weight Distribution System - 1,200 lbs TW
Trunnion Style Weight Distribution Spring Bar Kit