I am interested in adding shocks to my trailer!
Shock absorber should more accurately be called dampers like the Brits do. They so not absorb shocks, the springs do. The dampers dampen the oscillations caused by flexing the springs. The damping is necessarially dependent on the spring rate and suspended weight. This determines the resonant frequency of the system.
The dampers serve to dampen these oscillations and keep them within some limits.
The more important thing from our towing point of view is the damping in the side to side motion which is 180 degreesa apart. This translated into the swaying motion under the worst conditions and when braking and the trailer is coupled higher than the roll center of the TV causes upset in its stability. If the braking or turning forces exceed the limits od approximately .3G and the resuling forces put the TV in an oversteer condition a jack knife will occur.
Controlling these forces is why I want properly calibrated shocks for my trailer.
I tow with a 2009 VW TDI Sportwagen and when fitted with the OEM trailer wiring harness the cars stability system will activated the European mandated T-ESP control which will act to enhance stability of the system under this condition. The car will brake an individual wheel or wheels, accellerate, and give electronic assist in the proper direction to cancel the oscilations.
This is why I want to install the factory Westfalia kit in my JSW. ALso add the shocks as well.
Any car in Europe or the UK is required to have T-ESP to be approved to tow a trailer. Most do. I assume that this would include at least euro spec Subarus etc.
The european regulations and trailers are advanced compared to what is available in the US.
The key is properly calibrated shocks for the spring rate and weight. This is why I am leaning towards adapting the AL-KO axel and shocks to my 16' Scamp
. The shocks are calibrated to the AL-OK axles and weights as I called them out earlier.
The shocks are valved and the lever arms and shock length are also engineered for the axles. How this would work when adapted to the Dexter I wouldn'r know, but the starting degree is the same and the ride heigth is the same so the rate must be similar.
The size of the shock other than the stroke length would not matter since overheating of the shock would be unlikley.
If you have looked at the pictures and video I have posted you will see that they are ( as the Brits would say) a pretty piece of kit.
The other adaption from the Casita
setup from Orbital would also work, but as far as I knoe it would be a one size fits all and I don't know about calibration of damping.
Sorry for the long post, but sometimes it takes more electrons to say what I mean.