CapriRacer,
I did make it to measuring my wheel loads today. The data is more eye opening then I had expected. I have 300# total error in the data that I want to find before I post the data. This could be accumulative error of 50# from each wheel location.
While there is a shift in the total weight, the learning is these loads are more then my last weight slip. And it shows your point that wheel locations have different loads. Even with the 300# error I am not over on any tires max capacity but the reserve is for sure not what I thought it was.
How I found this 300# error is I also sanitized my water system today. I measured the wheel loads dry and then filled the camper with water. 42 gallons of water only weighs so much, the weight gain is more then it should be summed by all 4 wheels.
Sunday if things work out right I will take the rig to the truck scales and measure the total combined axles weights and split the axle loads on 2 scales to at least get a total axle load to compare back to the force jack data.
The issue is how to get an actual scale that can read individual wheel loads that the calibration error is not large. Even the certified truck scales are only accurate to within 50#. Need to find someone with those portable scales the state troopers use.
Something as a cross check is using the static load radius to at least confirm I am not at full load. The problem is what is the SLR of a Denman ST225/75R15 D load range at 65psi?
Comparing other brands, The spread is large enough that it is inconclusive for me to use it.
GY Marathon is 12.5"
GY MarathonThis site says the GY Marathon is 13"
NW trailer GY Marathon Tow max is 13.3"
Tow maxHere is the method I used. Ex Rocket Scientist would be proud... this is his method that I compensated a little more with it.
Load up the truck, camper and engage the WD hitch so it is transferring weight to the TT axles. Using a concrete pad, get all tires on the camper and the truck up off the ground on a 2 x 8.
Using a force jack, preload it sightly under the axle seat. Measure frame to ground as a cross check.
Jack up the camper and take the 2 x 8 out from that location.
After that pic I went to a bottle jack. The floor jack has an arc of travel with it and moves the camper.
Lower camper slowly onto force jack. Read gage. Check frame height to ground to confirm you are in the same place. It is.
Do all wheel locations. Fill camper water system and fresh tank over front axle. Redo wheel locations.
Take data and do moment calculations to convert load at axle seat to load at center of tire. Sit back and go, h'mm this is more then I thought.... and all 4 wheels are different.
More on Sunday. If you have any idea what the static load radius for that Denman would be, that would help as a cross check.
I have seen enough to convince myself I need more reserve capacity.
Thanks
John
