"Porpoising" - How to Tame the Rocking Camper
Struts are the only solution Lance parts representatives can offer for out of control forward and back rocking of a camper. Trouble is they don't support my 2019 Lance 650 on my 2016 Toyota Tundra (wi...
Forum Discussion
"However, there are certain roads, usually concrete roads with expansion strips spaced at a certain distance apart, that cause our set-up to significantly porpoise."
Of course. I understand this and it's not an issue with TC's only or even heavily loaded trucks, however heavy loads on the back of the truck, particularly weight that is behind the rear axle exaggerates this condition.
FWIW, this type of vehicle behavior happens because concrete naturally swells a bit over time at cut faces. And when control joints are saw cut into concrete paving at equal spacing, and at certain speed/wheelbase/joint spacing combinations, the small evenly spaced bumps create an oscillating motion. Some states specify varying transverse control joint widths which eliminates this condition (Washington still doesn't FYI).
This condition is more prevalent in vehicles with stiff front suspensions (IE trucks that carry campers) and even happens with empty vehicles.
If this is the condition one is trying to cure, IMO it's futile if the vehicle otherwise drives and handles well. But there are a few things that can help. Change speed, change lanes, have an ultra stiff rear suspension, different wheelbase length or make sure the center of load is in front of the rear axle. Shocks may help to an extent, but I don't see overhead cab braces doing anything in this case.
JMO after constructing freeways for the last 25 years and driving virtually every combination of light/medium duty truck all over North America.
Of course. I understand this and it's not an issue with TC's only or even heavily loaded trucks, however heavy loads on the back of the truck, particularly weight that is behind the rear axle exaggerates this condition.
FWIW, this type of vehicle behavior happens because concrete naturally swells a bit over time at cut faces. And when control joints are saw cut into concrete paving at equal spacing, and at certain speed/wheelbase/joint spacing combinations, the small evenly spaced bumps create an oscillating motion. Some states specify varying transverse control joint widths which eliminates this condition (Washington still doesn't FYI).
This condition is more prevalent in vehicles with stiff front suspensions (IE trucks that carry campers) and even happens with empty vehicles.
If this is the condition one is trying to cure, IMO it's futile if the vehicle otherwise drives and handles well. But there are a few things that can help. Change speed, change lanes, have an ultra stiff rear suspension, different wheelbase length or make sure the center of load is in front of the rear axle. Shocks may help to an extent, but I don't see overhead cab braces doing anything in this case.
JMO after constructing freeways for the last 25 years and driving virtually every combination of light/medium duty truck all over North America.
