Here's our '94 with the dash pad, etc removed.
I was replacing the windshield and changed the speakers while I was there. For the life of me I can't remember the brand but they weren't fancy as I was just interested in replaced the factory stuff. The cluster and duct work has to come out on the drivers side, duct work on the pass side.
They were drop-ins (like a 3"x5" or so) and not very expensive.
We don't even have a stereo for the road as we talk about everything we see while riding and the noise gets in the way. (giving away our age here) I have a storage tray built were the radio goes in the dash.
In the back we do have 360 sound with sub woofer for watching movies in bed.
It's a 110 volt system for camping.