I'm running a UV-25×4 with a Goal Zero 200x, temporarily, it works.
Somewhat similar to you, @WRYY282, my intention is to build a "portable mobile" in an ammo can type of contraption at some point in the near future.
I'm on the steep side of the learning curve at the moment but it looks like most of these mobile units call for 13.8v. I haven't fully started my research yet, but I'm planning on logging TX wattage/voltage/time. If I'm tracking correctly, running off of a battery at around 12v should lessen output watts compared to an optimal 13.8v?