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Old 04-27-2020, 09:46 AM   #1
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Air Ride suspension mods

I have a Holiday Rambler, 34 DP. It has air ride suspension. I also tow a substantial trailer, it weighs 7,000 lbs.

I often find when pulling into driveways, or anywhere the ground is significantly uneven that I drag the hitch on the ground.

I have often thought how handy it would be when negotiating something like a driveway to be able to lower the front, and or raise the back to keep the hitch off the ground.

I have done some research on the internet but can't seem to find anything handy.

Does anyone know of a way to TEMPORARILY override the factory settings and control each wheel separately, then return the ship to factory settings and automatic control?
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Old 04-27-2020, 09:53 AM   #2
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What you need is the Haldex Dual Ride Height system or a set of casters under the hitch. Here's a previous discussion on the problem.
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Old 04-27-2020, 10:44 AM   #3
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I'm sure that you could find a way to overide the height regulator valve but dunno that I'd want to.... ever seen one of them bags let go?
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Old 04-27-2020, 11:22 AM   #4
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I do that often with the Valid / Powergear air leveling system, but like a previous poster mentioned, it has a computer that over-rides the ride height valves.
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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Old 04-27-2020, 12:34 PM   #5
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You could do some sort of hack of the rear ride height control valves, which maintain a pre-set distance between chassis and road. My last coach had a momentary switch on the dash that would do that, temporarily raising or lower the suspension (had to hold the switch down or it would return to normal rather quickly).

You don't want to drive more than a very short distance like that because the drive shaft angle between engine and tranny is critical and an improper ride height can cause extreme wear on it.
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Old 04-27-2020, 03:17 PM   #6
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Have the HWH 10 bag system on mine. Have a “Raise” button on mine that Will raise the coach 3 inch’s from travel temporarily to get in and out of driveways ect. Not sure what system you have
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Old 04-27-2020, 03:24 PM   #7
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There is a company in Oregon, called Source Engineering. They sell a valve kit that does exactly what you want. They designed it for Monaco products. It comes with a valve that splices into the rear airline, that overrides the rear ride height valves. It comes with a 12 volt momentary switch that you mount on the dash. It will lift your rear, about 3".

I installed their kit on a Freightliner chassis, something they had never done. I've spoke with Jim, the owner of Source Engineering, and discussed how it could be installed. We collaborated and it worked great.

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Old 09-22-2020, 08:53 AM   #8
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I have made some additions to the air suspension. After much research and help from a fellow member.

Attached is a drawing. Rudimentary (I'm no draftsman). But it allows me to raise the rear about 3 inches, and raise the front about 3 inches (independent or at the same time).Or raise the back 3 inches and drop the front 3 inches.

I used safety protected switches on the dash so that they do not deploy accidentally.

Happy to provide more detail if anyone is interested.

I also raised the tongue of the trailer 3 inches offering a total of 8 or 9 additional inches of clearance at the trailer tongue.

I should also note that once I installed a pressure gauge (Can't believe it did not have one) I found the air pressure on the rig was running 70 to 95 PSI. This is too low. Easy fix (after research again) adjusted the governor to 100 PSI cut in and 120 cut out.
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Old 09-22-2020, 08:59 AM   #9
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Since you already did the research...I have one question (so far). The bags are designed to handle 120psi?
Rob & Laura
2002 American Tradition 40', 431hp Banks PowerPack
Mid-South TX
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