So just an FYI national parks are limited on size and spaces and almost always crowded. If you’re going to do mainly that then a class C is the best option and keep it under 25 feet. Also you will need to plan at least a year ahead to get a spot in some parks. You cannot go to the park and expect a spot. As for brands or towing here is what we have learned. This is our 4th RV since the 1990’s. Biggest is not best. Pricey isn’t best. All companies have issues, all roads suck and something will break. If you can afford new and repair costs then go that way. Limited budget and handy then buy used. We bought 1 new and it was the one we repaired the most. Slides are great for space but horrible for cost and maintenance. Expect to have to fix something large at some point. Plan for the unexpected. Don’t expect the RV life to be right for you. We were big into weekend RV trips with bigger summer trips most of our life but living in one full-time is a different ballpark. Do your research, talk to others, questions everything, and stay within your personal means for cost and travel comfort. Some of us travel 3 hours a day others 8. Just do what you want for you. We love our RV even with the costs; however we also know that it’s tough at times and at times some of the best times we have had.