I am thinking of starting a new thread and calling it
"Understanding payload and GVWR limits".
A part of what I would discuss would incorporate some of what I have learned in this thread. I need everyones help to make sure that I use accurate percentages. I have used Ron's example to figure and extract the rough percentages that I would use.
Ron's initial example of:
TV wheelbase = 130”
TV rear axle to ball coupler = 65”
Ball coupler to TT axles = 200”
WD spring bar length = 30”
WD spring bar rear end load = 1000 lbs/bar = 2000 lbs total
I would like to now introduce a tongue weight(TW) of 900#s.
Before a WD hitch is engaged: 1. What is the increased load on the rear axle? Approx 1350#s or 150% of TW. The added weight is a combination of tongue weight and front end weight transferred to the rear.
2. What is the decreased load on the front axle? 450#s or 50% of TW.
After a WD hitch is engaged as per example above with a total of 2000#s of tension:Summary of axle load changes from Ron :
TV front axle 611.54 lbs ADDED
TV rear axle 911.54 lbs REMOVED
TT axles 300.00 lbs ADDED
The WD hitch distributes 300#s or 33% to the TT axles, so the
LOAD introduced to the TV is 600#s or 67%. Of this 600#s, 162#s is now on the front axle and 438#s remains on the rear axle. The front axle lost 450#s originally but now it is only increased by 162#s.
The load on the receiver has been reduced by 300#s.
The load on the rear axle was increased by 150% of TW before the WD hitch was engaged. Now the load on the rear axle is only about 50% of the TW.
Conclusion regarding payload: The TV needs 600#s of available payload (not 900#s), after it is loaded with passengers, gear, and fuel.
On edit:
I did not consider the weight of the hitch itself. Lets say the weight of the WD hitch is 100#s.
