Here is a statement made concerning tires. My Windjammer just went out of warranty several weeks ago and this conversation took place before and just after the warranty expired. This came from Chris who no longer is employed there but was reiterated by his replacement. My tires were stress cracking while under warranty period so they sent me two replacements identical to the others. I showed him the weigh tickets indicated everything was within spec. I inquired about how close to capacity these tires operate and inquired about upgrading to D range from C range. Here was Rockwood's official response for all you others considering this. They were cordial, but firm on their response. I have removed my name. This came on 4/3/2015;
"I understand your concerns about the tires on your trailer. As we have discussed, I must advise you against upgrading the load rating of your tires because the trailer was designed to specifications that use the equipment installed at the factory. The weight of the trailer has a direct impact on the tires. When you have the trailer weighed, you must weigh the trailer all by itself (not connected to the tow vehicle).
The 2014 3025W model was built to a maximum G.V.W.R. of 8,930 lbs. At no point in time should the trailer ever weigh more than this amount. The dry weight of the trailer when it left the factory with no contents at its basic lowest weight is 7,550 lbs. The 2 axles are rated at 4,000 lbs each and each tire (rim) has a load rating of 2,150. On those specifications, your trailer has a combined total axle weight rating of 8,000 lbs and the combined total weight rating of all 4 tires is 8,600 lbs. The tires and rims are designed to bear up to 600 pounds more than the axles. When you account the combined tire load rating against the GVWR for the trailer, you must consider that 1,008 lbs of hitch weight transfers weight from the trailer to the pull vehicle.
As I have explained to you previously the trailer is out of warranty. The tires that were shipped to you were a goodwill gesture on the part of Forest River without obligation. I would hope that you accept my information and my advice, but you are the owner of the trailer and you will be responsible for any costs or repairs that could result from upgrading your tires. I will not be able to reimburse your expenses or warranty cover any repairs resulting from upgraded tires placed onto your trailer. If you would like to discuss the rims used in production of your trailer, then you must contact LionsHead tire for any discussion on the rims.
I wish you well and safe travels and hope your free tires will arrive soon."
Forest River, Inc
2014 Windjammer 3025W Diamond 34.5 ft 8300 lbs.
2010 F150 SC XLT 4x4 5.4L, 3.55 gears 20" rims
12 k Equalizer WDH, Firestone Airbags, HD Bilsteins
TST 507RV TPMS