Good plans come up semi frequently, you just need to know where to look. I worked from an RV full time for 2 years using only cell plans and I was pretty happy with the plans I had. I still use my Verizon Grandfathered Unlimited plan for home internet and routinely use >100GB/month for $80/month. That plus an AT&T connected car plan with unlimited data for $25/month and I am set. I spent a lot of time following https://www.rvmobileinternet.com/ before pulling the trigger on plans.