How much air do you have in your tires? You should have your rear truck tires at or very near the max cold air inflation on the sidewall. Your trailer tires should also be at or very near the max cold inflation level.
If the front of the truck is lower with trailer than without it sounds to me like you have not enough weight on the rear of truck. Your front fender measurement should not be more than 1/2" higher than unloaded.
If you are hooked up and walk to a distance and look at overall stance of the combined unit, your trailer should be slightly lower on tongue (off level). You need 13-15% of trailer weight on the tongue. The rear of truck should look like it has a load(down 2-3") from unloaded.
This truck should not be having issue with the weights you have posted for over all trailer weight.
You need 2 friction type sway bars (if this is what you are using), one on each side of tongue.
Set friction bar: from point of just barely being able to move bar by hand (because of friction drag)tighten bar 1 1/2 - 2turns. Make sure both sides are set the same. (remove these bars or release tension when you stop at campground entrance),
If setup still sways after this, you need a longer wheelbase truck. Understand that you will never eliminate 100%, but in case of IE: a bus passing you , going 20mph faster than you, you will feel the push, and trailer will wiggle slightly but should not last more than a second or two.
I have towed bumper pulls of all configurations with trucks of all types over the years and never been unable to correctly setup to eliminate sway if trailer weights are not grossly overloading tow vehilcle.
A hensley hitch will make all your issues go away within reason if your combination is reasonably matched.
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2011 325SRX , Mor-Ryde Pinbox
2004 Ram 3500DRW 6spd,4x4,QC.LB ,340L aux tank
1999 Concours
2014 FJR
2014 Jetta TDI
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