Truck Bounce
I just bought a 2015 Arctic Fox 811S camper and have it mounted on a GMC Denali 3500, crew cab, 4WD with a standard box (6.5'). I also have installed air bags on the rear. On my drive home from th...
Forum Discussion
I can get that 'porpoising' sometimes on certain road surfaces for a short period. I believe my camper's centre of gravity is slightly behind the rear axle of my truck, which isn't ideal. I suspect the more its CoG is behind the axle the worse this is. An 811 has a 9ft floor doesn't it? Is there any indication where along its length the CoG is supposed to be and if so where is that in relation to your rear axle?
I doubt it has anything to do with air getting underneath - more the road surface, especially if a concrete freeway which is poured in sections.
In my case I think changing the front dampers helped a bit, but the existing ones had 60,000 miles on them so were pretty tired.
Also, I find the pressure in the air bags makes a difference. I run mine at low pressure; too much pressure and I find instead of the rear suspension flexing and absorbing the bumps, it just passes them onto the camper resulting in a more choppy ride resulting in more porpoising.
Steve.
I doubt it has anything to do with air getting underneath - more the road surface, especially if a concrete freeway which is poured in sections.
In my case I think changing the front dampers helped a bit, but the existing ones had 60,000 miles on them so were pretty tired.
Also, I find the pressure in the air bags makes a difference. I run mine at low pressure; too much pressure and I find instead of the rear suspension flexing and absorbing the bumps, it just passes them onto the camper resulting in a more choppy ride resulting in more porpoising.
Steve.
