I was staying in Bozeman at the fairgrounds and was tired of being able to"reach out and touch someone", as is my neighbors, so on a whim decided to leave early and give Lost Moose Meadows a try(I'm always skeptical of private RV parks as my preference is more along the lines of state parks/COE campgrounds), and probably the best decision I've made on this trip thus far(3 months in). 

This is a relatively new RV park(opened 6 weeks ago) situated in a valley near a small town(Lincoln, MT) owned/managed by a husband/wife team (Matt& Nichole) who put their heart and soul into building this park (Also, super cool folks, very personable). They built the park from the ground up themselves and it shows they were RVers themselves and built as they would want to enjoy. Each site is like a little oasis with plenty of room to stretch (B3 feels like a 1/2 acre lot, and likely not too far off from it), plenty long enough for even the longest of rigs (some of the pull throughs are over 100 feet long). There isn't a ton of shade however to be expected as the park is new and there will be shade as trees mature. 

Originally I was going to stay here a few nights before continuing west however decided to stay 2 and a half weeks. It's a bit off I-90 however if you're simply looking for a place to stretch out, this is definitely it and worth the trek.