Originally Posted by 6mm
Pro series WD hitch with a Pro series friction sway control ...
Economy model. Barely adequate when properly set up. You should have spent more for your hitch. But that's water under the bridge now.
and still get some sway and called the dealer and he told me to put on a additional sway control on the other side.
My question is can you over do it with the sway controlers and make it to stiff and effect the overall driveabilty????
Yes, with that cheap sway control system, you need a sway bar on both sides of the tongue, and both of the sway bars tightened down really tight. You want the hitch really stiff to resist, but not stop, the trailer from turning. That resistance (friction in the sway bar slides) is what helps control sway.
After you're all hooked up, drive a few feet while turning in a tight circle, both ways (figure 8). If the trailer turns, then you don't have the sway bars too tight.
Also checked the tires on the trailer and they are only load range D.
Most trailers have load range C tires, so yours are somewhat unusual in being load range D. And with 14" and 15" wheels, load range E trailer tires are really rare. If you have 16" wheels, then you can expect a load range E tire. Load range doesn't matter as far as sway is concerned. Just be sure all the trailer tires are pumped up to the max PSI shown on the sidewall of the tire. That will minimize tire sidewall flex which can contribute to sway.
Also check the max weight each tire can carry at the max PSI. Multiply by the number of tires on the ground and compare the total to the total of the GAWRs of the trailer. I want my trailer tires to have at least 25% more weight capacity than the combined GAWR of the trailer, but most tires that come on new trailers will barely have enough weight capacity to handle the GAWR, and less than the GVWR of the trailer. I usually wind up with blow-outs on the stock tires and then replacing the trailer tires with bigger tires that have more weight capacity. And I usually have to also replace the wheels because the stock wheels are not wide enough to handle the bigger tires. My 5er came with ST205/75R15C on 5.5" rims. I replaced them with ST225/75R15D on 6" wide rims. After that, Maxxis came out with ST225/75R15E tires, so I have those on another trailer.
When I get to a scale how do I find the toungge weight????????
Francesca gave you the quick and dirty answer. It does require weighing twice. One time with the trailer but without the WD spring bars hooked up.
The second time without the trailer, but with the WD shank and hitch head (ball mount) in the receiver.
GVW = the combined weight on the front and rear truck axles. GVW with the trailer minus GVW without the trailer = hitch weight.
Trailer axle weight plus hitch weight = gross trailer weight.
Hitch weight divided by gross trailer weight = percent of hitch weight after you move the decimal point two places to the right. Example:
Hitch weight = 650
Gross trailer weight = 5,000
650 divided by 5000 = 0.13
0.13 = 13 percent
You need to determine percentage of hitch weight before every trip when hauling various weights. Ideal is about 12% to 13% of gross trailer weight. Less than 12% can contribute to sway. More than 15% needlessly adds weight to the truck suspension so requires more GVWR on the tow vehicle. 13% to 15% is okay, but if you're overloaded over the GVWR of the tow vehicle then you need to redistribute the weight in the trailer to get the hitch weight percent in the 12 to 13% range.
But weighing the rig twice for every trip is a bit inconvenient and expensive. So I invested in a Sherline tongue weight scale. Very easy to determine tongue weight before every towing trip - just before I hook the wet and loaded trailer to the tow vehicle. Here's a link to my Sherline:
Sherline Trailer Tongue Weight Scale - 2,000-lb Capacity Sherline Tools 5780
You need to weigh the whole rig on the CAT scale at least once every trip. The CAT scale will give you trailer axle weight. Add the tongue weight to trailer axle weight and the answer is gross trailer weight. Then the math to figure percentage of tongue weight is easy.