GDMBR sections southbound from Helena, MT

I’m planning on about 3 weeks, plus or minus, on the GDMBR south from Helena. Beginning mid July, though I am flexible on dates. Probably “book speed,” so 30-60 miles a day, though longer days are not out of the question. I may or may not have my wife driving a sag wagon for all or part of the trip, and if I do any riding buddies are welcome to throw their stuff on board. TBD. I’m male, 62, an intermediate bikepacker who is working on the route in sections. Join me for a day, a week or whatever!