I am a tradie and have a 2013 Isuzu 200 truck with a 21 ft caravan, I been on short trips but when the truck hits a bump the caravan rocks up and down. Have you had this occur with your truck, I just trying to sort out this problem before I start out. Could anyone give me their thoughts.
I do not have that issue nor any other as my rig is ideal however I would suspect that the only cause of your problem would be worn out Shockers. If your truck has been a tradie vehicle I would suspect that they have never been replaced.
Could be a number of issues. Truck is o nm ly 4yo, shockets should be ok. Whats the weight of the van, the towball weight? Overhang truck rear wheels to towbar? Level rides might be a fix?
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Major cause of this problem is rigid truck rear suspension. This can be overcome with an articulated air bag hitch which cost around $1000 approx. They allow vertical movement between the caravan ball coupling and the truck hitch. The more rigid truck suspensions are the reason why towing capacity of 50mm ball coupling used on trucks have been downgraded in the latest revision of VSB6.
I towed a 5th wheeler with the same truck for nearly 6 years, no issues at all being a 5'er but came across many towing vans with the same truck and most had fitted an AirHitch to overcome the problem you refer too.
The Isuzu NPR has a long overhang to the tow hitch and also very hard "dual action" rear springs so that exasperates the issue. An airhitch will solve your problem.
What size towball are you using? I just read in the past couple days that these vehicles need to use a 70mm ball or be limited to under 2000kg trailer.
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Neil & Lynne
Pinjarra
Western Australia
MY23.5 Ford Wildtrak V6 Dual Cab / 21' Silverline 21-65.3
If you want some ideas about a more flexible towing hitch for your caravan, I would suggest you go to look at the rigs the show people use. They have spring loaded tow bars for their trucks to tow their big living vans or they have had in the past. I have not looked at them for some years. I guess there was someone who was making them specially for that trade
There is no reason it has to be an airbag type but perhaps that is the only type readily available.
Might also be worth looking at the way your van is loaded maybe a bit less weight on the tail and a bit more on the ball as long as it does not take you over the ball weight limit.
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