First place to rust is floors, front, towards the front of the door. Drip rails were poor design, plug up, water comes into the cabin from the front doors and sits on top of the floor under the carpets.
Next place would be rockers, but I doubt you will see that in Arizona.
Also the rear quarter, if you want to call it that. Right behind the door, but in front of the rear wheel, right at the bottom. Rear wheel slings water etc. towards the front and it gets in there and there is no where for it to drain. Rusts from inside out, make sure someone didn't bondo over the area to hide bubbles or pinholes.
SUPER hard to find patch panels specific to these trucks, easy to find stuff common with the pick ups. Floors are easy to find. Patch panel for that area in front of rear wheel not so much.
93 is last year, only year with 360 Magnum. Sheet metal for 91-93 was a major downgrade from 87-90, but from AZ it shouldn't matter that much. Wiring quality sucks too. See if the gauges all work etc.
if you want to collect it, this one will be somewhat special as production numbers are low for 93. Most people picture the late 80's models though when it comes to nostalgia. For this body style, "Canyon" versions got body matched grill, otherwise it should be chrome.
If you are going to drive it, you can upgrade the radio speakers to 6x9 pretty easy, they bolt into the doors with minor trimming of the metal and into the rear seat area with some trimming there too. You will want a low power sub of some type to get the MASSIVE volume of air inside to move if you want a modern sound.
The plastic dash panels are made of explodium at this point. You will have to move like a brain surgeon to work on anything in that area. Don't be surprised if there is a crack or two in any of the plastic trim anywhere inside. You can use various things to weld it back together, no one makes replacements for Ramcharger that I know of.
Make sure the rear roof vent has a non-broken latch. NEVER OPEN IT. That is a can of worms you do not want any part of. Nobody makes anything for them, even a seal.
All of these look good in old school turbine style rims, Dodge even offered them factory a few years. 31.5x10.5x15 looks good on factory suspension with factory rims. No loss in giddyup to speak of with 3.55 gears in my experience. Yes you can surprise a few people with a 360 Ramcharger.
Don't lift it. I mean it's your truck but it ruins them and they look weird.
If you want to install 90's looking chrome nerf bar side steps, you will need to find universal fit type. This is because the parking brake is in the way for everything, you will have to heavily modify or remove it. Otherwise you are stuck with rocker mount or none.
I am not sure if it is the same with the Magnum powered trucks, but LA powered the efi is a simple TBI but the ENTIRE brain of everything in the truck that gets some type of electrical power is ONE GIANT ECU BOARD. Including the voltage regulator. A one wire alternator will bypass this but you get a check engine light.
Source: I own and daily(summer) a 1990 I went through a couple years ago. I live in WI. I had more bodywork things to do then you will. I get comments weekly. Everyone that owned a Bronco, Blazer, or one of these for the 20 years they made them recognizes them, knows how damn fun they are, and wants one. But you can't find them, or can't afford them. This isn't like working over a 69 or 70 B body that you can basically build a car from aftermarket stuff. You will need to find used or be inventive, or do some serious internet search-fu. LMC truck has stuff common with the pickups and a few bits for ramcharger. So if this one is in prime shape it is worth a premium just in saved hours of scrambling for parts.
