I spent several years trying to do the same thing, but all I wanted was the ability to carry my 300 pound dual sport motorcycle.
I have seen some people carry a small motorcycle on the front of the truck. Yours is too big. Mine would block the headlights.
Super Hitch makes a hitch bar that is double, over and under. It is intended for trucks that have a camper sticking out the back and want to tow a boat. It will handle a 4 foot extension. I only need about 2 feet.
I gave up on that idea because the longer the hitch bar is the lower it will be when going over driveways. I am already very close to the ground. I have scraped the TM battery box twice, once in a paved driveway and once on a dirt fire road.
So I stopped towing with my 2002 Chevy 1500HD, crew cab with a 6.5 foot bed and added a 2008 GMC 2500HD, crew cab with an 8 foot bed to my stable. This solved my problem. I carry an 800 pound Polaris X2 two person ATV in the bed. I still take the Chevy, because I have 2 ATVs and 2 dirt bikes.
My Chevy, with two motorcycles in the bed, drops so low that I can not remove the TM front wheel unless I jack up the back of the truck. 600 pounds of weight in the bed was apparently a lot more than I had carried previously. The 2500HD has stiffer suspension and is taller, so I do not have a problem with excessive sag.
Although the 2500HD is bigger it gets the same gas mileage.
I got a good deal on the GMC. It is now 3 years old and the Kelly Blue Book rice shows that it has a value that is still a little higher than I paid new.
On my trucks I can hook the tailgate straps up and over the side pins. This puts the tailgate at about a 45 degree angle. That provides just enough extra length to carry a longer ATV. But even then I would ned to be extremely careful with u-turns.
Another alternative is to remove the tailgate.
The distance from the rear axle of the truck to where the hitch ball is mounted is a significant factor in the end result of how close the hitch bar gets to the ground when going in and out of driveways, such as gas stations.
I have a friend that built a special lumber rack so he could load two sand buggies on the top of the lumber rack and still put 3 dirt bikes in the bed, but he had short motorcycles and a long bed.
In my opinion, your only choice is a longer bed. Let me know if you find an alternative solution. After 3 yeas I gave up trying to engineer a solution.
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