We bought out the Verizon plan for $175 and switched to Millenicom and have 20GB for less than 10GB with Verizon. No worries about running over the penalties from Verizon are steep. Check the many complaints by Verizonwireless customers on the company's own community forum for overbilling of these "overages".
We cannot get cellular phone service at our house but we can connect to the cell tower for 4G data. I added a mast with a parabolic grid antenna tuned for Verizon's 4G band and a Surecall signal booster and a LMR-400 cable and get an adequate signal at the house. On the road we use the same Surecall RF signal booster and I mounted a Digital Antenna for 4G on the roof of the RV and ran 240 series cable through the roof. This makes all the difference between getting a signal and not in a great many places we have stayed.
The RF signal boosters all use 5-12v DC power and work with either a 12v cigarette adapter or a 110v AC adapter so they work at home or on the road.