RV Park between Grand Tetons & Glacier Natl Parks

If you're looking for a place somewhere between the Tetons and Glacier, you need to be looking up around Bozeman and points north, up the east side or west side of the Rockies. Which side are you going to enter Glacier?
Great Falls may have something nice.
On the other side, look at Missoula. Those are a little further than half way I think.

You're limited as far as what you are looking for near The Grand Tetons. The best RV park around there is Colter Bay but there are lots of trees, heavily wooded, for both the full hook up and dry campground. There's the Virginian in town but we've driven through to check them out and it's basically a parking lot. There's the Teton Resort RV park, but that's not quite a resort - dirt parking lot and side by side. Flagg Ranch off the Rockefeller Hwy is also heavily wooded with dirt sites. You may have to compromise in that area. Another thought would be to stay on the Idaho side in either Victor or Driggs - check that area out on campground reviews. I know there's a nice little RV park in Driggs with your criteria. There's one in Victor we stayed at but I don't remember a hot tub there.

We visited Glacier two consecutive years and stayed at different RV parks - one was Mountain Meadows - very nice, wooded, no hot tub. Then we stayed at the KOA there, near Hungry Horse. Super nice, both wooded and open meadow sites and they have a hot tub. We used it and enjoyed it, especially late at night with the stars out.

Hope this helps.

Personally, I try to stay away from RV Resorts, but google search turned up these:

No. 1 Luxury RV Park -Polson (Part of a review: "Great views of the lake and mountains out your windshield. The pool is small and the hot tub adequate and it is shared with the KOA. However, there is a nice but small fitness center for the resort. I stayed 7 days and loved the experience of the resort and Flathead lake." Ditto on a 2nd review: "Escort to the site. Check in after you are settled. Manager greets you at your site with gift bag. Daily news paper delivered to your coach. Trash pick up 2 times per day. Wine and cheese mixer on Friday. Breakfast on Saturday. Shuttle to farmers market. Great views. Attention to detail. Clean with lots of space.")

Eagle Nest RV Resort -Polson (Part of a review: "Paved roads, level gravel sites, many trees, wonderful people in the office, owner who takes a "hands-on" approach to making sure everything is done correctly, pool (didn't use, not open yet), hot tub that was, very clean restrooms and showers. It was quiet as it has one of the most attractive Mobile Home Parks I have ever seen in front, a golf course in the back and not much on either side. Birds are the only thing that will wake you up in the morning." Another review: ""Resort" is right. Very clean, pool was great. Close to bike and hiking trail around the city of Polson. Close to Flathead lake and town. Staff very friendly. They even have a "cocktail hour" with appetizers by the pool at 4:30 every day. Really enjoyed our stay there and would definitely stay there again. The sites were level and very well maintained. Sites weren't real spacious but adequate.")

MT Guide: RV Park, Campgrounds & Resorts

West Yellowstone: Grizzly RV Park and Yellowstone Holiday RV Park & Marina

With a week to 10 days, a detour over to Teddy Roosevelt Nat'l Park might be neat (a cool area) by Medora, North Dakota.
Not a true resort, but In A Pinch ?; sadly no hot tubs. Ditto