As with many full-timers, we also use a Verizon JetPack and and 18 - 20 GB data plan (depending on how willing my wife is to limit streaming of facebook videos of the grandkids...). There are good tech forums on RV-Dreams.com and the Escapees web site (both geared toward full-timing). There is a also a couple who do a lot of writing on mobile technology - search for "Technomadia" and you should find them. They offer a mobile internet handbook that's a go-to source of information for a lot of folks.
Rob