Your problem may not be so much with weight, but wind resistance. Large front and even the back of the trailer being higher than a bumper pull create an awful large vacuum as it moves through the air. The faster you go, the more pronounced it becomes. It increases not on a even scale, but jumps up! Slowing down is the only thing you can do to help your truck. Right lane on US Highways and avoiding Interstate highways with higher speed limits in your future.
I had to move up to a 2500 because of this. Weight played a role too, but wind resistance was the bigger factor for me as I stayed in Florida on flat land. 1500 GMC was shifting a lot too. Slowed down from 65 plus, to 60 to 62 helped most before my - new to me, used 2500 CTD Dodge and now 65 is no longer a problem (trailer tires max speed rating) and I have taken it to the mountains of N. Ga. and Tn. with no problems.
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Bob and sometimes - Nina - a Staffordshire Terrier/a SPOILED pit and her kitty Spaz
2006 Dodge SLT 2500 4x4 Cummins Quad Cab w/AT and 3.73
2007 Salem Sport LE 26FBSRV (TH) w/ my Victory Motorcycle in it or a EZ GO Shuttle cart.
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