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Frame Mod


MoneyMakeranch
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Question for all those in the know, Our NEW to us VOLVO 780 has a custom bed already installed with just a gooseneck ball. looking at how the bed is built structure wise I can open up the top and get down to the frame rails with no problem without removing the bed support beams.  the hitch that I have is and AIR SAFE omni 25k which is square and straight up on the sides and it will not fit between the truck frame rails at the top without cutting them back about 1.375 (1 3/8) on each side due to the support towers and air bags of the hitch on all four corners. has anybody narrowed the top frame rail to accommodate a wide hitch like this? I love the ride that this hitch has and with the stiff suspension of the truck I need it to work. also, this truck is still tandem running super singles.

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Some years ago I made an adapter to allow for the use of a traditional 5th wheel hitch with attachment to the gooseneck ball.  The gooseneck hitch had been welded to the frame of the Dodge while my friend who bought this truck, wanted to use his 5er hitch.  It was way better to make the adapter than to cut the gooseneck hitch from the truck frame.  He is still using it to this day.

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the height will be good at between 45 to 47 inches, my only question is trimming the frame rails on the top to allow for the width of the hitch. I need to trim the rails on the inside about 20 inches from the rear of the truck frame.  hope the pics come thru  

 

[URL=https://i.imgur.com/PlE737m.jpg "target=new"][IMG]https://i.imgur.com/PlE737ml.jpg "border=0"[/IMG][/URL]
[IMG]https://i.imgur.com/m3zZPvb.png[/IMG][URL=https://i.imgur.com/PlE737m.jpg "target=new"]Click For Full-Size Image[/URL].

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2 hours ago, MoneyMakeranch said:

Omni-25 1

a pic of the hitch  you can see that it has straight sides.

Is there room to notch the towers of the hitch side frames?  You wouldnt need much to clear the truck frame, I would think.  May need to add a stiffener if needed or an angle bracket that can then be bolted to the truck frame for reinforce it due to the removed material for the notch.

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In the simplest terms, that hitch has a form factor that is not designed for the installation you desire.     

In your frame pictures the rear axle air bag is where you want to cut the frame.     Everything from the air bag forward is an absolute no.    The only way I would mount that hitch would be on top of the frame rails and alter the pin box to accommodate the hitch Hight.    It is not what you want to hear, if mounting on the fame wont work, another hitch designed to fit inside the frame is needed.   

 

Steve

Edited by Steve from SoCal
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