From day one, it porpoised pretty badly. I had to use the floor jack to hold the Draw Tite hitch up there until I got the bolts … How to remedy travel trailer porpoising??

I was also towing my boat which is a 20 foot center console on a tandem axle trailer with dual axle hydraulic surge brakes. The boat and trailer combo weighs 4,400lbs (1995 kg) as indicated by the weigh scale I stopped at in California and my …

Being reasonably inexperienced at towing caravans I have noticed that the car will bounce (porpoise) when travelling over dips or hills in the road surface, potholes or bumps are not a problem only an undulation in the surface. Towing porpoising Jun 1, 2016 20:19:26 GMT -5 via Tapatalk .

I will measure the static height and adjust from there. While it sounds like you may need higher rated bars, it is possible you were feeling "porpoising" due to road conditions. Cement roads make it worse.You state that you have a new truck. So, after doing a lot of internet research, I … length to set up a harmonic resonance when going over regularly-occurring bumps like concrete pavement joints.

I eventually made a steel clip from 2 bolts with U's on the ends and a turnbuckle in the middle. When we got our trailer, I assumed I should run the rear tires at 80 p.s.i., but doing so wore the center of the tires out.

we'll see how it goes.Yes, it appears that weight distribution within the trailer is your problem. There is no sway at all just this occasional bouncing, the back of the car was dipping when I was coming to a stop but I got rid of that by adjusting … I found that when I ran 45 lbs in mine I would get porpoising. any ideas??Hi. Hitting a bump with one side would cause it to compress and send the pressure to the other side. I ratchet strap the bow down and use 2 more from the bow eyes on the nosecones to the bunk supports and take the weight off the winch strap.

They aren't cheap (unless you find one used) but can make all the difference in the world.A porpoise is usually an overweight tongue or pin cause the springs don't have the backbone they need.I'm wondering if you have too much air in your bags. Let us know what you find works. I have 6000 lbs on the rear axle and I run 35 psi in the bags. "[/FONT],2008 Jayco Designer 35RLTS 5th Wheel (39').http://s219.photobucket.com/albums/cc64/racechaser1/air bags/?Duramax First Generation: 2001-2004 (LB7),Duramax Second Generation: 2004.5-2005 (LLY),VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I saw something that dampens the existing spring at the shackles, will this work? Re: Towing Issue - Porpoising #15 Post by BobG » Fri Oct 30, 2015 5:36 pm In addition to ratchet straps front and rear, I have a 2" ratchet strap that goes from the bottom of the middle tube, around the frame, and back to the bottom of … First stage is the multiple pack, and the second stage is the single thick spring.I'd take that T out of the line and run two separate lines. Thats a single axle trailer? I removed the Timbrens because I didnt like the unloaded ride but I never experienced porpoising with the Timbrens. I am pulling about 8,000 pounds with my GMC hd2500 gas truck. On a single axle trailer like yours and towing with a 3/4 ton I prefer to have a little too much tongue weight. My Timbrens would normally sit approximately 1/2 inch off of the axle tube but when I would cross a speed bump or railroad track it would produce a violent snap back as the Timbren came in contact with the axle tube. I am starting to see that the problem is really coming from the excess air pressure. I'd say it must weigh somewhere in the mid 30lb range, and to think I've been towing TW of about 1150 lbs, no wonder it would porpose on the un-even roads. Here are some simple steps to get to a very common base of starting and then fine tune the PSI.Thank you for all of your great advice. Quote. ).2007 Chevy 2500HD Classic LT Crew Cab Duramax, Reese 5th Wheel hitch.I run my bags at 30 lbs when towing. This gives me about 1/4 inch off the overloads. Did you make changes to the set-up on the hitch for this truck? I started loading them at 45 psi and did have more porpoising than with the Timbrens. GPS 76 mph.zoom650 makes a good point...I too strap down the two outer toons at their eyes.Here's a link on how to weigh your trailer tongue.Agreed, tongue weight is important, but strapping the bow down to the trailer on highway runs does eliminate a lot of the dipping too. This happens to me when I go over a certain bridge at a certain speed on the way to the beach. Select Post; Deselect Post; Link to Post; Back to Top; Post by paroadking1 on Jun 1, 2016 20:19:26 GMT -5. Can you pickup the tongue when boat is loaded?...not enough tongue weight if you can.I agree with the "not enough tongue weight".2012 Tahoe 24' Fish-n-Fun Tritoon, with Mercury 115 HP 4-Stroke.Easiest way to test it is to fill a couple of big coolers full of water or something similar.