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What you have described is, in all probability, is a LRC tire.
Your best information for Original Equipment tire information will be found in the owner’s manual or the vehicle’s certification label. The label will be attached to the external left forward section of the trailer. Sometimes found on the side of the 5th wheel hitch.
From the few figures you have provided I feel your trailer has two 4000# axles for a total GVW of 8000#. Most 5th wheel trailers have pin weights in the 15-20% range depending on how the cargo is arraigned. So remember to deduct the pin weight from the GVWR.
The tire manufacturer name you have given has been around awhile and is found as OEM on other name brand trailers. They were manufactured in China.
Tire fitment for RV trailers is determined by the vehicle’s certified GAWR found on the certification label. Not to be confused with the axle manufacturer’s certification label found on the axles.
Many of the RV trailer manufacturers provide minimal tire & rim fitments, especially in your weight range. At best, your tires will only provide a grand total of 450# of load capacity reserves for a full load.
There is a simple upgrade that will increase your tire load capacity to 2540# at 65 psi and that’s the ST225/75R15D. It’s the same size, it just has a couple more cords. Unfortunately, that upgrade may not be as simple as it appears. The vehicle manufacturer may have married the 2150# tires to rims that are not capable of supporting the increase in tire pressure to 65 psi.
This is longer than I intended. If you have questions I’ll try to answer them as they arise.
FastEagle
-- Edited by FastEagle on Wednesday 23rd of January 2013 03:19:22 AM
-- Edited by FastEagle on Wednesday 23rd of January 2013 03:20:26 AM
-- Edited by FastEagle on Wednesday 23rd of January 2013 03:21:23 AM
Recently I purchased a new fifth wheel - Rockwood Signature Ultralite and have a concern about the tires provided. The tire name stamped on the sidewall is Trail Express - ST 225/75R15.
The tire load rating which is also stamped on the sidewall is 2,150 lb at 50 psi and since I have two axles the total allowable load is 4 x 2,150 lb or 8,600 lb.
The GVWR stamped on the side of the unit says 9,564 lb, a dry weight of 8,052 lb, and a maximum cargo weight of 1,462 lb.
If I understand the principal, I can only have cargo weighing 8,600-8,052 = 548 lb. based on tire specifications and yet the fifth wheel manufacturer says I can carry 1,462 lb. Does this mean the unit should have different tires that would boost the allowable load carrying capacity nearer to or even above the GVWR?
