Sorry--I don't understand the question. Front and rear axle of the truck? You don't use a % with axles, only the tongue weight.

that's what I'm asking percentage of tongue transfered to each axle of the truck

With this suspension ,i could put 1000 # weight on the hitch ,start the truck and it will return to the original height front and rear . It pumps the rear up and lets air out of the front

I suspect you won't believe me--and that's OK--because there's an easy way to verify what I'm about to write. (I've done it on my F-350 so I know it's true--at least for my setup.) Here's the deal: adding or taking away air in the suspension does nothing to move weight around. It levels the truck. Period.

If your tongue weight was 1,000 lbs before starting the truck it was still 1,000 lbs after the truck leveled itself.

If you'd like more information on how I can claim this, please see this thread: https://gdrvowners.com/towing-and-hi...wing-a-315rlts Specfically post 9 if you don't want to wade through all the information (but I think it will be very helpful if you do)

BL: There's no % formula (that I am aware of) when using a WDH as far as what-goes-where on the axles. When a WDH is engaged, some weight is transferred forward to the front axle and some is shifted back to the camper's axles. A CAT scale will tell you where it is going.

You are absolutely correct , even though height is fine the front end is light . I know it's hard to picture if you don't know the system but if I set it up measure the truck front and rear (unloaded) then drop the trailer onto the ball (without bars) measure again,adjust the bars to get most of the sag out of the rear and get the front to settle back down , then start the truck the height of the front and rear suspension then changes back to normal which changes weight distribution .

Go to a CAT scale and do the following (If you use the Weigh My Truck app on a SmartPhone this process is super easy):

1) Go across the scale with your truck and camper loaded as if going camping (or as close as possible). Have your WDH engaged.

2) Drive off the scale and remove the WDH applied by the hitch and just the WDH. In other words, 0 links so no weight is transferred anywhere. (Leave all the hardware where it is and attached, just don't transfer any weight around). Go across the CAT scale again.

3) Drive off the scale and completely disconnect/park the camper somewhere safe in the parking lot. Now drive just the truck across the CAT scale and get it's weight.


The difference in your truck's total weight from #2 to #3 is due to the tongue weight. Add the tongue weight to the weight on the axles of the trailer. This is the trailer's total weight.

The tongue should be ~13% of the trailer's total weight. If it is not around 13% (10-15% is the range often quoted) the weights from step 1 are not going to be useful (and you'll need to reaccomplish). Get the tongue weight % right first.

If the tongue % is right you'll be able to figure out from the weights in step #1 where the WDH moved some of the weight and how much.

A key value to look at is if the front axle's weight is near the front axle weight measured in #3. If not, you need more "links" in the WDH (to move more weight forward). If there's too much weight on the front axle of the truck, remove links.

After all that's done...THEN level the camper and truck. Recheck by accomplishing steps 1 and 2 again.

Hope this helps.

thanks for the help . I really think my main problem is too little tongue weight .Trailer as it sets is about 7800# , tongue weight 800# .The driver that delivered it here said that thing tows like a dream . he was driving a dually with no sway control but the trailer was full of water

I would be tempted to first connect the trailer to the truck on a level pad. Without moving the truck or trailer, raise the trailer just off the ball and turn the truck back on. The truck should adjust back down to it's nominal height. Then turn off the truck so the compressor is disabled and re-connect the trailer to mechanically adjust the hitch. Once this pre-load is adjusted in the hitch, the truck will re-adjust slightly to its nominal setting once turned back on. All this is assuming your built in compressor is disabled when the truck is turned off.

This is a similar method that I'm using with my airlift airbags installed on my truck with an Equalizer hitch. Except I am manually adding air to the aibags....no chassis mounted compressor. My truck handles the 940 tongue weight extremely well on rough Michigan roads.

Jim