I would be extremely wary of anything a tire salesman says, especially one from Discount Tire. I recently went to Discount for a new set of Michelin XPS Ribs, after I blew one of the Towmaster ST junk tires that came as original equipment on my 5th. I spoke to 2 reps and arranged for an appointment a few days later. When I brought my 5th in for the new tires, they had jacked it up on 4 jacks and removed 2 of the tires when another rep came along and said they would not install the XPS Ribs on my unit because the weight ratings were not as high as on the ones that came originally on my 5th. The originals were Towmax ST junk but had a load carry rating of 3500# as opposed to the 3042# XPS Ribs. I pointed out that my axles were only rated for 5200# each and the Ribs were easily capable of handling that but the rep insisted they would not install them on my 5th. He then said they could put on Goodyear Load Range G tires that would be acceptable, as they had a 3775# rating and they had 4 in stock so they could proceed with the installation right away. They were almost $100 per tire more but I bit on this and had them installed as I was traveling home from our winter vacation and I needed to get new tires and get going. Later that day I just knew something was wrong and it finally came to me..... my rims were aluminum rims rated for 80psi and the new tires were 110 psi. I drove back to Discount and told the Mgr what they had done and he stated "Ooops, forgot about that". He then proceeded to tell me that I could: 1. Just drive them like that as the rims would probably be OK or 2. Deflate the tires to 80# as they were much heavier tires and would likely be OK even at the deflated pressure. To my uneducated mind, either one of these alternatives would have been MUCH less safe than installing the XPS Ribs that I had requested.
To make a long story a bit shorter, I returned the tires to Discount and got a refund and them went elsewhere and had the XPS Ribs installed. I've been a happy traveler ever since, but would NEVER deal with Discount again.
