Silesia? Best places south of Billings (if you like mountains) are out of Cooke City-Lulu/Daisy Pass, Goose Lake roads or Morrison Jeep trail. Enough to keep you entertained for at least a couple of days and with a winch to get you out, shouldn't need lockers. Not that many places that are that bad anyway unless there is a late snowpack. July 4th can be pretty iffy as to snowpack.
1947 CJ 2A, 1949 CJ 3A, 1955 CJ 3B, 1968 CJ 5, 2012 JKUR