jray3 said:
JoeS said:
... there's a big difference between a hitch tongue load of 200# and the cantilevered load ...
Agreed that the cantilevered load is tougher, but at least our NA market version has the rear bumper brackets to hang off of, which really helps in this case.
This forum has many wonderful technical discussions that help me to understand my car. -- Thank you.
jray3 shows that the NA version allows a much stronger bracket that better supports a Cantilevered Tray, but the load on the rear and the lifting of the front isn't improved with the stronger bracket. My dimensions were taken from my NA version with a longer distance from the back bumper to the rear axle than the non-NA version.
Cantilever Tray:
With a the tray center 18” from the bumper, and the back bumper about two feet from the rear axle, and the front axle about 100’ in front of that, about 142% of the Load in the middle of the tray will rest of the rear tires, while 42% of the Load will pick up the front tires.
Trailer hitch load:
If the ball of the trailer hitch is only 6” from the back bumper, about 130% of the Load on the ball will rest of the rear tires, while 30% of the Load will pick up the front tires.
If the hitch ball supports 200 lbs (90 kg), the front is lightened 60 lbs (27 kg, 30%) and the rear axle supports an additional 260 lbs (27 kg). For the Cantilever tray to add the same static stress only 143 lbs (65 kg, 30"/42"= 71%) could be supported.
Take-a-way:
Use only 71% of Ball Load for Cantilever Load