[Marvin]

I am still scratching my head as to what "hydraulic rebound control" might be.

It's a damper (shock absorber for many Americans) that has electronically adjustable valving on the rebound circuit. The Cybertruck has electronically adjustable damping on both the compression and rebound circuits (two electro-valves per damper). It adjusts the damping on the fly, based upon the action of the shock absorber, amongst other things.

 

[Marvin]

Thank you for the door jamb specs. It is interesting that the extended range unit is 1968# vs. the specked 2100#. I am now wondering if the max range unit will have a lesser payload.

Brian

Yes, it's pretty much a given that the max range will have even less payload capacity. And you will have to subtract the weight of any tonneau cover from that (since it doesn't come standard with a tonneau cover).

 

[Marvin]

So, I've been trying to figure out what the hydraulic rebound control is that keeps getting referred to in regards the Trail Boss and AT4.

The best I can make out is that it is the equivalent of a hydraulic bump stop only on the rebound side of the shock rather than the compression side. Here is a diagram of a shock with integrated hydraulic bump stop. Note, on the right, that it is a separate hydraulic valve set that creates additional resistance as the shaft stroke approaches the end of its compression stroke. I think the hydraulic rebound control is this sort of valve, only on the top of the stroke where the wheel is at its largest droop. This makes sense for higher speed running with heavy wheels and tires where you want the suspension to follow the terrain but not hit a hard stop in the shocks when they fully extend. Most suspensions will already have some form of mechanical bump stop on the compression stroke.

Hopefully, we will know more soon.

View attachment 5627

What did you see that made you think the active damping only functions near the end of the stroke?

It would make more sense for the damping valve to have an effect over the entire travel of the suspension. That way it could better adjust for heavy and light loads and different air spring rates.

 

[Marvin]

Here is the door sticker/capacities of the extended range Trail Boss with Premium Package.

Towing 12,300 as reported, payload of 1,968.

View attachment 5859

Interesting that 5th wheel trailers are not allowed. I say this because people on this forum made a HUGE deal about the bed wings on the Cybertruck preventing 5th wheel trailers from being used. I guess that was pretty short-sighted criticism since GM disallows them anyway!