Sumo springs
I have an 2012 Allegro on a 24k f53 chassis. As many gas burners know this is basically a camper mounted on a truck chassis. I don't have issues with stability, but the ride is rough to say the leas...
Forum Discussion
the trippers wrote:
Sumo springs, or Timbrens, are designed to prevent sag, to keep an overloaded vehicle more level, don't think they will ever soften the ride. Unless your RV is now sitting on the factory bump stops.
I use them on my 12 yr old pick up truck for carrying heavy loads and maintaining some levelness and control.
On F53 chassis, the Sumo/Timbrens are preloaded. They replace the bump stops when installed. The problem with the F53 chassis is that the manufactures wanted a softer ride, so Ford tried to give them it by installing a light single rate spring. Unloaded, the MHs ride pretty good, but when you get close to the max weight, the free space between the bump stop and springs is well less than 1". Under normal road conditions, this can, and does cause a jarring ride when the springs hit the bump stops. If you doubt this, just put some modeling clay on top of the springs, below the bump stops and drive it. Then measure the clay, if there is any left, to see the results. If Ford would install a dual rate spring sets, much like they do on their heavy duty pickups, the ride would be more than acceptable. Bad roads, and misaligned bridge abutments will still be bad, just as they are in a DP.
