CapriRacer wrote:
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?
Our pin weight hugs 18% throughout GVW and has - on occasions - been as high as 2700#. (Our washer/dryer is just forward of the axles on the main floor level. All newer models are in the forward bedroom closet.)
OE tires were GY Marathons sized ST235/80R16D - made in the USA.
Keystone has sort of quit up-dating the Everest specs because it’s a discontinued model but in the reference you can see the tire sizes.
2003 Everest specsFE
