Thankfully I've not used a tow truck for over a decade, but I'm reminded of my teens when myself and every buddy of mine had memberships because we needed them with the POS high-school cars we drove. Ahhh those were the days....
As with most roadside services they'll be contracted to local tow outfits, the same as any manufacturers roadside assistance program. My last use was perhaps 2007 for a lockout in my Power Wagon after a day of hunting and Dodge sent out a local tow company.