when I upgraded from my 05 to a newer truck I had to modify my 5th wheel trailer... It was easy to adjust the B&W gooseneck hitch with companion tall enough to work... I think I also had to move the pin box in the RV to a different set of holes.... but finally needed a 2"wide x 3" tall x 6" long rectangle tube, 5/16" wall thickness installed between the springs and the axles..
I found on Amazon I think 9/16" u-bolts by the length needed for the modification.. I removed 1/2" but wanted the extra strength of the large bolts... I had to drill one side of the tube and install a piece of round stock for the pin on the other side... to keep the spring and axle pinned together... took me... a retired guy about a day to do it once the spacers were made... my total cost was under $150... and of course my labor...
I've seen others get this done in a shop for $800-$1000 ...
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Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
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