Your trip sounds close to the reverse of the ~8,000 mi trip we made last year! (AZ, CO, MI, FL, Gulf Coast, NM, AZ)
The two groups we joined were PassPort America (for full hookup sites) and Harvest Hosts (for boondocking).
I suggest you consider adding 12volt capacity for boondocking more than two nights in a row. We added a second group 24, 12 volt battery and had no trouble boondocking for 5 days in a row (no generator) using LED lights only (no television or other electronics, fans, or furnace). If your 12 volt needs are greater, you'll need to think about other options. Also, be aware that your tow vehicle will not charge your battery enough for multiple boondocking nights in a row.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.