[spiritedEV]

I think these may be the same Nokians if your's are Outpost nAT? I originally put the stock size Nokians on but traded those right back in for 285's

 

[spiritedEV]

My experience with the 305/70-18 is about .1-.2 mpKWh loss compared to the factory 24" wheels and tires. The 285/75-18 Nokian severe snow rated tires I replaced the Hummer Goodyears with didn’t change it.

I think these may be the same Nokians if your's are Outpost nAT? I originally put the stock size Nokians on but traded those right back in for 285's and happy I did. There are 295/65's that are very close to stock as far as height.

 

[spiritedEV]

Just drove today about 150 miles at 80mph, very hilly, and scored 1.7 mpkh. In town, usually 2.2. May try 70 mph on the way home. No meaningful loss for me if there is any. The truck is just better with them. Have hard tonneau as well.

Coming home tonight was 1.81 over same road, 80 mph. My wife drove, so...maybe the problem is me

 

[SEVRSTW]

These are pretty impressive specs for the price.

 

[Suburban]

I think these may be the same Nokians if your's are Outpost nAT? I originally put the stock size Nokians on but traded those right back in for 285's and happy I did. There are 295/65's that are very close to stock as far as height.

Yes, Outpost nAT. I want to keep the width as close to stock as possible. I don’t need flotation of style.

 

[flyinglow]

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.

 

[flyinglow]

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

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

 

[moosetags]

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

 

[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!

 

[flyinglow]

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

The extended range gets 2100# without the Premium Pkg but that package adds weight (midgate and MultiFlex tailgate probably accounting for most of that) which lowers the payload. I was expecting that but wanted to know how much.

 

[moosetags]

That is my thought also. I am planning to go with the max range and would add the solid tonneau cover. I need enough payload to handle my travel trailer that has 950# tongue weight.

Brian