25k I would accpet and proceed with details checks, and probably you can find something that be used for final negotiation.
factory offroad suspension as I remember they are all yellow color (perhaps bilstein?).
if he changed the radiator make sure its original, because GCC car's radiator is thicker, (contains more volume of coolant), and he might changed with a duplicate radiator that is the regular sized, whose cooling isnt as effective as the original sized radiator. and yes, the thermostat wouldnt cost you alot for a repalcement.
tires not sure, I am still a fresh newbie with HT tires
for the registeration, you will have to do the ownership transfer in SHJ, and request for an export plate(it comes as stickers), and you can just drive the car with stickers to Dubai and register. you can handover the cash as soon as you have the possession certificate with your name in SHJ. as I remember even for export plate, the car has to pass the test in SHJ too.
the wear and tear on top of the steering\shift knob\driver seat's entry side support can tell the truth of the car's usage. with 130k of usage, you shoulnt see surface of these are tore open, and i know dealers like to change the mileage to around 100k from 200k or even 300k, so watch out on this.
my best advice is to hire a used car advisor even if he charges 500 AED for the visit, if you dont have anyone really know about used cars. the actual saving will be beyond this 500 AED.