Re: 37 feet of Gnar
Reunel states their built-in receiver is rated for 20,000 pound towing and 6,000 pounds tongue weight.
The key for you is the bumper/frame interface. Even Reunel could do better. Look at how and Class-5 Hitch receiver attaches and try to mimic that.
The stock Reunel mounts bent on mine. I did have 6,000# trailer hooked to the ball on a hitch rack carrying another 600 pounds which was plugged into a 8" hitch receiver (required for dry boxes to clear the carriers), and the bumper brackets bent when I hit a recently constructed water bar at ~50 MPH, which sent the van airborne and into a pretty rough landing. If think the Reunel had larger frame mounts, it would not have bent. I've done worse things with my prior Class-5 hidden hitch.
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2000 E450 dually V10 wagon
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