Bouncing on Concrete Roads
We just finished our fourth trip with our new trailer. Been camping for years with a smaller trailer, but just moved to a 31'. I have a situation that I need to figure out when we are on roads th...
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IDK.. I dont have that issue anymore... I feel its the chevy hitches or you guys are set up wrong.
I ran my other camper and truck (chevy) with after market hitch and never had porpoise issues. That truck had bilsteins from factory.
New truck with factory hitch and stock **** shocks had it..Porpoise.
Now with new hitch and shocks no issues. On any roads. I ran from NJ to florida, and they all back roads homes through alabama, tenn, KY, VA, West VA, ohio, PA, etc etc. Road straight and true.
740lbs TW 14%. Hit a dip or dips rear dips them dampens slightly at bridge embankment.
Something is wrong if your bouncing like a bronco that its scary and uncontrollable.
The sumos I put on were for sag and nothing for the porpoise issee. In fact I ran to FL without the sumos.
The hitch fixed the issue. The shocks fixed 40-50% of it. I did shocks first. Hitch several tows later.
BTW, go out and look at the GM hitch. Why does it have two bolts attaching the hitch to the bumper? Does the OP's have this? Is GM still doing this?
The replacement hitch I installed does not have those but it does have a very high lb rating. Hmmm, I wonder? How does the bumper survive a 5mph impact without ripping those bolts out? Hmmm?
Here is the issue with that bumper mount. You can tighten the bars all you want but that design will not allow you to transfer weight with the WD.
It has those two bolts on the bumper because they've cheapened the receiver. It no longer is strong enough by itself to do the weight distribution from the hitch to the frame rails.
Needs to transfer that force to the bumper. The bumper is designed to take a hit from different direction, so will bend in the direction the receiver pushes.
Then the bumper will try to transfer that loading to the brackets holding the bumper to the frame rails.
This "food chain" will bend the bumper and brackets so that not enough of the WD from the hitch is transferred. Why many can't drop their TV's front end with a WD hitch and WD bars...no matter how heavy a bar and how many links tightened.
For those who still don't believe, take a 2 inch square bar about 6 feet long. Shove it into a NBS receiver and lift. Note that the receiver tube will bend towards the bumper, the bumper will move up and bend. It's brackets are behind so can't see them, but they will move before transfering enough load to the frame rails.
Also look at other NBS receivers that have been used to tow heavy. Most all I've seen in parking lots are bent either downwards or upwards.
I ran my other camper and truck (chevy) with after market hitch and never had porpoise issues. That truck had bilsteins from factory.
New truck with factory hitch and stock **** shocks had it..Porpoise.
Now with new hitch and shocks no issues. On any roads. I ran from NJ to florida, and they all back roads homes through alabama, tenn, KY, VA, West VA, ohio, PA, etc etc. Road straight and true.
740lbs TW 14%. Hit a dip or dips rear dips them dampens slightly at bridge embankment.
Something is wrong if your bouncing like a bronco that its scary and uncontrollable.
The sumos I put on were for sag and nothing for the porpoise issee. In fact I ran to FL without the sumos.
The hitch fixed the issue. The shocks fixed 40-50% of it. I did shocks first. Hitch several tows later.
BTW, go out and look at the GM hitch. Why does it have two bolts attaching the hitch to the bumper? Does the OP's have this? Is GM still doing this?
The replacement hitch I installed does not have those but it does have a very high lb rating. Hmmm, I wonder? How does the bumper survive a 5mph impact without ripping those bolts out? Hmmm?
Here is the issue with that bumper mount. You can tighten the bars all you want but that design will not allow you to transfer weight with the WD.
It has those two bolts on the bumper because they've cheapened the receiver. It no longer is strong enough by itself to do the weight distribution from the hitch to the frame rails.
Needs to transfer that force to the bumper. The bumper is designed to take a hit from different direction, so will bend in the direction the receiver pushes.
Then the bumper will try to transfer that loading to the brackets holding the bumper to the frame rails.
This "food chain" will bend the bumper and brackets so that not enough of the WD from the hitch is transferred. Why many can't drop their TV's front end with a WD hitch and WD bars...no matter how heavy a bar and how many links tightened.
For those who still don't believe, take a 2 inch square bar about 6 feet long. Shove it into a NBS receiver and lift. Note that the receiver tube will bend towards the bumper, the bumper will move up and bend. It's brackets are behind so can't see them, but they will move before transfering enough load to the frame rails.
Also look at other NBS receivers that have been used to tow heavy. Most all I've seen in parking lots are bent either downwards or upwards.
