We stay in State, COE, Federal and really most any campground we want including Thousand Trails..:E. Trick is to call ahead and ask about size appropriate campsites. Most State and Federal CG are modifying at least some of their sites for larger rigs. Try this, many State CGs use Reserve America. Pull up some of the places you like and plug in your 42' length and see how many sites come up. Yes, you won't be able to get into every site, but there will be a place for you.
You'll enjoy the extra smoothness that comes from the tag. Unfortunately, Winnie doesn't offer the owner adjustable tag like Monaco. I'm also not sure if the Tour comes with a liftable tag. That's a great feature also.
Downside is two extra tires come tire buying time, two extra TPMS sensors and an extra charge when you go through the toll booth. Some states prohibit three axle vehicles in the car pool lane unless you're a bus.
Good luck, if the floor plan is acceptable, you'll enjoy the coach. Friends of mine have a 40' Tour with a tag and have been fulltiming as long as we have. They enjoy it and only issues they've had was with the AquaHot which isn't Winnie's fault...Dennis