LSPV question

I was thinking of installing a manual LSPV along side a RAS system.

My question is since the stock LSPV pressure is determined by the distance between the axle and the bed since I would be installing a RAS along side it to level the rear of the truck under load would a manual PV thats set correctly perform the same under load as it would unloaded?

If its never been tested before and nobody knows ill gladly make my truck the guinea pig but from all the research ive done it seems it should perform the same under load. (My truck has the tow package and a brake controller, i don’t expect the exact same stopping distance vs unloaded but the trailered weight shouldnt make a significant increase in stopping distance)

 

LS = Load sensing, i.e. variable.
Manual = set-it-and-forget-it, it's static, it'll never change, it DGAF what you put in the bed.

The latter of the two is what vehicles, at least in the GM world I came from, have always had. Hardest part is dialing in the proportion correctly.

Got quite a few members running Wilwood's manual PV kit that the FirstGenTundras site sells. I mean, a couple running that specific mounting kit, but several running the Wilwood PV.

 

Ive seen the wilwood PV and it’s probably the one im going to run should i install one, I was more curious if my line of thinking was correct that the LSPV detects load from the distance from the rear axle to the bed and a RAS levels your truck out with load so it would cancel it out anyways so apart from borderline max GVWR loads, you could expect relatively similar stopping distances regardless of your load. (With a correctly set manual PV)

 

For clarity, I plan on installing one of these with it: https://activesuspension.com/products/toyota-tundra-1999-2021-sd

 

So how much weight are you planning on hauling inside the bed? How much tongue weight are you planning to have when towing? What frequency are you going to be loaded down? Does your truck have a lift kit? Let us know those things, then maybe some of us here have make a more accurate suggestion on the adjustable prop valve.

 

LSPV has a lever system. You can look from under the bumper of your truck forward and see the armature. As you add things to the bed, and the leafs sag, reducing the distance between the axle and bed, the LSPV armature acts on the LSPV itself to open the PV, allowing more fluid engagement to the rear drums.