handye9 wrote:
1502 - (400+100+100) = 902 lbs available payload
902 / .13 = 6938 lbs loaded trailer
Since you're allowing for the weight of the WDH, you might as well use the WDH for its intended purpose.
The purpose of a WDH is to remove load from the TV's rear axle and transfer some of that removed load to the TV's front axle and some to the TT's axles.
A properly sized and adjusted WHD can transfer a load equal to approximately 25% of tongue weight to the TT's axles.
That means, with WD applied, the vertical load imposed on the TV is not equal to the tongue weight.
With WD applied, the vertical load imposed on the TV is equal to approximately 75% of the tongue weight.
Therefore, for the above example, the maximum allowable tongue weight -- based on payload -- would be 902/0.75 = 1203#.
The corresponding maximum allowable trailer weight (assuming 13% TW%) would be 1203/0.13 = 9254#.
But, the OP's Expediton has a receiver tongue weight limitation of 920#.
Therefore, for the above example, it is the receiver capacity rather than payload capacity which limits the maximum allowable trailer weight.
Assuming 13% TW%, the trailer could weigh 920/0.13 = 7077#.
In this case, the difference between 7077# and 6938# is not huge.
OTOH, if the "available payload" had turned out to be 800# instead of 902#, properly accounting for load distribution to the trailer axles would allow the calculated trailer weight to be 7077# versus 6154#.
Ron
