Do you keep original tires on rv when going to Alaska?

We went to Ak in 2011 with our 2010 Denali fw. The tires were over a year old, but less than two, so I figured I might as well get the use out of them. I started noticing wear on inside edge of left rear about 2/3 of the way to Glacier np. I bought two new tires, keeping the better one. I later noticed that the tires on the left side were about 1/4 inch further apart than the right side. I rotated the tires several times on our trip to try to make them last longer. When we were in Tok on our way back, one of the tires looked worse than the others and I had the one tire that I kept from the tire sale mounted on the rim. Guess what? That tire blew in the area of Destruction Bay.
Bottom line, those tires on the trailer are probably relatively cheap. If they came with the coach and are 3 years or older I would replace.

I put new tires on our motorhome and toad truck before our Alaska trip last year. We had no issues the whole trip. I would put new tires on for your trip and upgrade the quality by 2 levels. If yours are C go to E.

Nothing magically bad about the drive up there vs any other rugged country down south. But for an extended trip I'd want 2 spares anyway so I'd go new heavy tires and keep 2 of the China bombs for spares.
That said, knock on wood, I've driven it a few times, heavy and pulling trailer and had no flats.

Funny... We were having dinner tonight with our buddies, and this exact subject came up due to our upcoming trip to Alaska.
We have a 1 year old Keystone Cougar fifth wheel, and plan to put new Maxxis tires on before we leave. They have a higher capacity, and we never had a problem with our old unit with Maxxis. This is NOT an add for the brand, but for the $600.00 investment, it might be worth it.

CHANGE THEM. I have many trailers, horse, flatbed, 5ver and TT. In my experience trailer manufacturers always equip trailers with a load range tire one load range less than the trailer should really have. So do change them before the trip, and step up one load range with the new tires. ---- I have the exact same situation for my May 3 month Alaska trip. I did not want to take my large Grand Junction 5ver and bought a second tandem axle 26 ft smaller camping TT. I am replacing the load range C tires on it now with a much stronger load range D tire just before the trip. I also carry a complete wheel bearing kit, and have installed a heavy duty lubable spring shackle kit. It also has Super Lube axles so I carry a grease gun to give the bearings a few pumps several times during the journey. ---- Have a great trip.

Thanks everyone for the great advice! We will probably get new tires all around and take 2 extra spares for both. We don't want tire issues if we can avoid them. Thanks again for the help...

We replaced the tires on both of our trips to Alaska. We also took two sets of spares for the truck and the TT. We were not as concerned about how they looked as how old they were. In both cases our TT was used and we did not know how many miles the tires had on them. On our first trip we did not have a flat ourselves, but "loaned" one of our spares to another camper. Last summer we did a lot of off road towing including the Dempster Hwy. We had two flats on the way home, one in Reno and one outside Grand Junction. We were so fortunate that neither incident resulted in any damage. lizzie

Personally I wouldn't worry about if provided they are newer, and in good shape. My 2012 Oudoors RV Timber ridge came with the Goodyear Marathons, which I believe are made in china, but held up really well. When I traded the trailer in the tires had something over 25 thousand miles on it and the tires looked great. My experience is trailer tires tend to age out long before they wear out unless you have suspension issues.

is it worth looking at Costco?

Good question , Gary. I remember reading somewhere years ago, that Costco Tires were classed as 'Club Tires' and had a shorter tread life. They were the same grade that manufacturers put on their new vehicles. This applied to Michelin tires, but could have been applicable to other brands, as when I mentioned this to my Mazda dealer, they said they had noticed that original tires had always worn out faster than their replacements.
I have never been able to find that info since.

If you are buying new tires...is it worth looking at Costco? Reason being they have such a great return policy and with stores through-out your trip routing..maybe worth considering?

Gary Haupt