FastEagle wrote:
My RV trailer is a 37'1" fifth wheel, manufactured by Keystone. It's certification label lists the GVWR as 14,100# and the two axles with a GAWR of 6,000# ea. Since early to mid 2006 the trailer has been fitted with Power King TowMax STR tires rated at 3520# @ 80 psi. I'm currently on the second complete set and they are always aired to 80 psi before going down the road on them.
Tire Size
FastEagle
As a tire engineer, I note the following:
If we assume that the tongue weight is supposed to be 15% of the GVW, then 85% is supposed to be carried by the tires - that's 11,985#. So the 6K axles are - on paper - ever so close to being overloaded. I'm sure everyone is aware that tire loading isn't the same for each axle - and I'm sure everyone is aware that the loading won't be the same side to side. So the entire picture here makes me nervous.
The good news is that the tires are rated substantially above the GAWR.
Question for FE: Are these the original tires? If not, what was?
