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Old 02-18-2020, 04:51 PM   #1
B&P
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Installing risers on 39resb3 & setting up truck

Before I install risers on 5th wheel I need input on the height of my truck.
When towing should the rear end of the truck be at factory height? Should the truck be level front to back or Should the back be slightly higher then the front?
I have a 2018 ram 3500 4x4 dually, b&w hitch mounted 2in in front of back axle & at the lowest setting. I plan on moving the hitch to the center height so I have a little room for adjusting if needed.
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Old 02-18-2020, 05:45 PM   #2
Cummins12V98
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I have a 15 DRW RAM 4x4. My B&W hitch is full forward on the lowest setting. My truck sets "LEVEL" with my RAW of 9,750#. I do have rear air ride to keep the load level. Your RV should put your truck near level.

I strongly advise to keep the hitch FULL FORWARD with the head supports straight side towards the cab.

I have a bit over 6" clearance at the tailgate.

My RV sets at 13' 5" with 3" risers.

Your truck should look like this with RV attached and ready for the road.

I am 55" to top back corner of the bed in pic.

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Old 02-18-2020, 06:11 PM   #3
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is your truck level before you hook up? My back end seems pretty high and when I hook up my headlights are high. I only put about 25lbs of air in bags because the trailer is way out of level. Unloaded the front of my truck is a about 39in and the back is about 42 in. Ground to fender. Morryde wants to know what height I want to ride at and I have no clue
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Old 02-18-2020, 06:16 PM   #4
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Disregard last post. Are you headlights high?
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Old 02-18-2020, 07:56 PM   #5
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B & P, are you going to MORryde for the risers?

If so I would suggest you adjust your hitch to middle setting (high/low), I would also follow Cummins' suggestion as to front/back adjustment. IF you're going to MORryde they will measure your trailer and determine what amount of rise you're going to need. They added 2" to ours and it rides nice and level. Like Cummins I have the air ride rear suspension, truck rides LEVEL with any amount of weight on it! I LOVE that rear air suspension!!

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Old 02-18-2020, 11:12 PM   #6
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Does your truck ride level when Not towing?
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Old 02-19-2020, 07:41 AM   #7
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It sure does! That's the beauty of the air ride suspension, it automatically adjusts the height for the load on board.

If you're going to get the risers at MORryde, set your hitch, get your truck level WITH your trailer on and have MORryde determine what amount of rise you're going to need to achieve "level" with your trailer.

My old '06 RAM 3500 would run nose high with the trailer on it until I installed air bags to "assist" the truck to the level position. Now I don't have to mess with level adjustments, truck AND trailer are ALWAYS riding level!

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Old 02-19-2020, 12:47 PM   #8
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Originally Posted by B&P View Post
is your truck level before you hook up? My back end seems pretty high and when I hook up my headlights are high. I only put about 25lbs of air in bags because the trailer is way out of level. Unloaded the front of my truck is a about 39in and the back is about 42 in. Ground to fender. Morryde wants to know what height I want to ride at and I have no clue
Whan you go to MORryde "THEY" will determine what size riser you need. YOU need to have hitch set to 6" bed clearance and they will go from there. With 6" and then they raise RV the bed clearance will increase some.

My truck looks exactly like it does above without a load in ALT ride mode.

Since you have added bags like I did on my 11 DRW and MS I ran 30psi LOADED and truck sat "LEVEL" as it should.

First pic current truck unloaded, second pic 11 with bags at 30.


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Old 02-19-2020, 12:50 PM   #9
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I would get the 3" risers and be done with it!
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Old 02-19-2020, 12:56 PM   #10
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Loaded or unloaded I am at 39

You must be adding 25psi BEFORE hitching. The pressure goes up after hitching. I would be at 5psi unloaded and about 30 once loaded.

You WANT your truck to ride level or 1" rear high no more. This will give a great ride keeping it on the overloads ALL the time!

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Old 02-19-2020, 12:57 PM   #11
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Forget about the headlights they can be adjusted!
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Old 02-22-2020, 07:17 PM   #12
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After weighting the truck hitched up The front axle was 100lbs lighter. Taking your advice about adjusting hitch head to the forward most position and center height should solve my problem.

Thanks for your input
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Old 02-22-2020, 07:33 PM   #13
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Moving your hitch to the forward position "may" not solve your axel weight difference. Lowering your hitch so your trailer is closer to level will help even out those axel weights. IMHO the higher you're nose is from level the MORE weight you'll be transferring to the rear axel. I'm pretty sure Ron (Cummins) will agree. Traveling as close to level is going to keep your weights equal on BOTH axels and that's what you want. Just my 2 cents tho.

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Old 02-23-2020, 11:02 AM   #14
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Dan, spot on!

B&P post all your axle weights after adjusting hitch so you are at 6"+ clearance at tailgate. Without risers you will be much heavier on your rear RV axle. Before my risers my front was 6,360# and rear 8,020#.

With 3" rises my front is 8,700# and rear is 9,240# so basically about as good as it gets.
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Old 02-23-2020, 09:30 PM   #15
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Originally Posted by Cummins12V98 View Post
Dan, spot on!

B&P post all your axle weights after adjusting hitch so you are at 6"+ clearance at tailgate. Without risers you will be much heavier on your rear RV axle. Before my risers my front was 6,360# and rear 8,020#.

With 3" rises my front is 8,700# and rear is 9,240# so basically about as good as it gets.
So by adding risers you also added 3,560# to your total axle weight?
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Old 02-24-2020, 05:37 AM   #16
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So by adding risers you also added 3,560# to your total axle weight?
Yea they were kinda heavy.

From the time my RV was new it has gained some weight. I was just showing the relationship between risers and no risers.
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