Hey, Scott--
Until you get something more sophisticated, you might want to keep an eye on voltage levels with an inexpensive digital voltage display in one of your 12v power sockets (if you're not already doing so).
I have one like this Innova model. They call it a Battery and Charging System Monitor but it just displays the voltage at the socket and you have to interpret what that means. But it's better than guessing what the LEDs indicate.
My Innova has been reasonably durable but it has come apart at the tip. That black plastic piece on the end has screwed itself out a couple of times over the years. I should put some threadlocker on it (just don't glue it, though, as there's a fuse in there you may need to change sometime).
I also like that I can take it to the truck (unlike a hard-wired one) and see what it's battery and alternator are doing.