Thank you all so much! What a wonderful forum for RV advice! We won't be towing with this being a rental. If we visit the park, we'd like to hike some and from what I've read trailhead parking fills up quickly. I'm trying to picture this in my mind and somehow I have a feeling that once I manage to get an RV into its campground parking spot, it may not be that much fun to move it around the park for hiking purposes. I wish we could rent a fifth wheeler for the trip, or tow a smaller car, but rentals for overseas tourists seem to be limited to motorhomes. I'll give this some more thought, but at this point I'm thinking maybe we should avoid Mt. Rainier as a first destination. We're heading up north, but were told it's best to stay around the rental company for the first day or two, in case we find something that needs fixing, so I was looking for a destination near Tacoma/Seattle. Maybe Mount Rainier isn't the best option for that though. Maybe we should just drive through the Cascades to the Lake Chelan area for the first couple of days and head up north from there instead.
As for rental costs, no, they're not cheap. Including full insurance, renting a motorhome costs anything between $100 to $250 a day for a 25' vehicle. It depends on how far in advance you make the reservation. Right now, if I were to try and book one for August, it would be in the $250 range. Waaaay out of our budget. I talked to the local agent and she said she's hoping we could go under $100 a day for a long rental, if we book in September (for August 2015). $100 for the RV + $30 a night for campgrounds (we plan on sticking to provincial parks CG's in Canada, at $12-$15 a night, so I'm averaging). With a minivan, rental would be $45 and motels $80, so it's a little bit cheaper. However, those are the rates for the lower 48. From what I've seen, we'd be pressed to find accommodation in Alaska and in some areas of Canada for under $120, or even $150 a night, in the height of season. In which case, the RV option becomes the cheaper one. As for gas, from what I've seen it should be 2.5 times more expensive than a minivan, so an additional $1500 to the entire trip. Coming from Israel, gas prices seem very low to us (half of what we pay here), so that's ok ๐
Right now, I'm working on a detailed plan so I'll have our dates ready come September. Fingers crossed that we get a good quote on the rental making this plan come true.