We have been fortunate enough to get the 100 loop three times, last time last week. Overall the best loop in my opinion, but tough to get ... good luck. The sites are not the biggest, but we fit with a 40' Motor home.
We also like the 900 loop, across from the Meadows. Not a preferred however. Our favorite site in 900 has been occupied since Feb. Wow ... that's some big bucks for a full time camp site.
The 1200 loop is very cool, and we would like to try it sometime. Lots of room and two pull thrus.
We have stayed in the 400, 500, and 700 loops also with our 40' rig and backed in OK. You can fit in these loops unless you get a tough one.
Remember to check the book when you check in ... it shows a plan view of the loop and you can get an idea of what lies ahead.
Have fun at the best CG in the country ... you will be making memories you will never forget.
John