Just to throw out a few observations about this truck, yes overall it's a nice truck.
But; heres some items that get my attention:
The bed, its a std Japan import bed, as I earlier pointed out these were subject to corrosion, this one from the pics looks very clean.
The front bumper; this is an SR5 model bumper, chrome and has a notch on the top edge. Std model bumpers are black, or chrome but flat with no notch on the top edge.
5Spd trns; this an SR5 item only, non sr5 had 4spd.
Graffics on the side are similar to sr5 but not sr5.
While all Toyota a/c units at that time were a dealer add-on (this was due to Toyota avoiding an added import tax) the a/c vent below the steering is not a Toyota a/c dealer add-on kit. The dealer add on kits were always sourced from Toyota, a dealer could not source these kits elsewhere if they wanted to remain an official Toyota dealer.
Inside door handles and inset on air cleaner have been painted.
Dash top cover is from a 1988 model, the package tray on the dash gives it away.
Mirrors and door handles should be chrome on an SR5 truck, these are black.
Nothing earth shattering, but a lot of mid matched parts that make me wonder about the trucks true heritage.