I'll very much add my "X2" vote to YC 1's for the Maximum Signal Max Amp RV! We used a WeBoost Drive 4G-M prior to getting our Max Amp, and the Max Amp has consistently given us better, stronger signals in areas where the WeBoost gave us little or nothing. And as said, our Max Amp gives us end to end coverage in our coach, where the WeBoost kept us within a few feet of the inside antenna. With multiple devices and two people using them, that end to end coverage is a major plus for us. And the customer service/tech support at Maximum Signal is nothing but top shelf!
I should add for 5'ver/TT use, Maximum Signal does have a package that supplies the antenna setup for both the truck and trailer, making it easy to move the Max Amp back and forth for use while under way.