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I'm dealing with the same tire issue on our 2006 3400RL. First had Mission tires which started having tread separation in about 10,000 miles. TireCo, Missions US distributor replaced all 5 tires with Freestar which last about 10,00 more miles until one shredded this month on the way to AZ for the winter. Did about $1500 damage to the 5th wheel.
In the process of trying to find replacement LT tires have looked at Firestone Transforce HT's and Michelin ribs which are highly recommended by other 5th wheel owners. However, neither tire comapany will warranty then on a 5th wheel and some of the local tire dealers are reluctant to put on 3040 lb rated tires when the original tires were rated for 3500 lbs. I don't think independant tire dealers will have a similar issue.
Now am looking at Maxxis ST tires. Really wanted to go to LT tires. Goodyear G614's require 110 psi and the rims on our unit are probably not up to handling that. The deluxe aluminum rims we have show only a weight rating of 3,040 but no PSI rating. Apparently these rims were re-rated higher in 2007 but some developed cracks at the higher loads. So am reluctant to gamble on that.
Montana really did us a disservice by installing very low quality Chinese Bombs with weight ratings that are not realistic on our 3400RL. 6000 lb axles/suspension and 3,040 lb rated rims and 3500 lb rated tires are not a good mix for this particular model 5th wheel. In 2007 Montana changed to 7,000 lb axles on the 3400RL.
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