Hey all, thanks for the advice. I currently have AT&T as my personal accounts (ZTE Mobley Hotspot & Galaxy S8+) and access to a Verizon card through work(I believe Jetpack 6620). A few things I've noticed..
Verizon is horrid, at least compared to what I remember a few years ago. The gaps along I-70 in central/western KS into eastern CO are large and again, weren't there years ago. They have noticeable gaps outside the interstate as well. Their coverage map seems at best false advertisement, because there are large gaps in coverage. I had Verizon til I switched to AT&T because I felt I was paying a ton for what was declining coverage. It became a deal breaker, and as soon as my contract expired, I took all my lines over to AT&T. My bill was considerably cheaper.
AT&T Mobley is nice because it is truly unlimited (I have never been throttled on that account) and it hooks into the car. However, it is often out of service while the cell phone has perfect service. I have considered upgrading to a better hotspot, but because I do have business access to Verizon, I have held out to this point.
That said, I have looked at that Nighthawk idea, and would hope to increase my coverage area a bit. However, I have read that this device is not included on unlimited plans. That concerns me.
My station has offered up the idea to customize me a wireless system to ensure I am connected as much as possible. That's where I am seeking ideas on a router that can support multiple service providers. The 3G store linked in one of the first replies got a just-under $500 price quote. That right now is leading the charge. And may ultimately get the green light. The Mofi 4550 is also getting a look from me, so thanks for suggesting that. That is a completely new device to me, so I am going to check that out as well.