Assuming that you are only looking at wagons, these were only sold in Australia with 'County' trim, which includes carpet, insulation, power steering, self levelling rear suspension via a Boge strut (which probably no longer works and has been supplemented by stronger rear springs), rear sway bar, and tinted windows. 
Most of them have factory airconditioning, which is not particularly good, has a lot of vacuum operated bits that probably don't work now, and you lose the under screen vents. A few have after-market airconditioning.
There are two significant changes - in 1986, the gearbox went from four to five speeds, the V8 changing before the Isuzu (and the five speed does not stand up well to the Isuzu - the four speed, designed for the military 101, but also used in early Rangerovers, is very durable, even with the Isuzu). In 1987 the doors went from lift to push button handles. This went along with thicker doors meaning a smaller wheel and less elbow room, but the doors are probably more durable. 
As pointed out by Jim, most of the V8s will be very tired by now, but by the same token, some will have been replaced or overhauled. The V8 does not tolerate neglect. On the other hand, barring accidents, it is likely that an Isuzu will still be good for many tens of thousands more kilometres.
But all of them are in excess of twenty-five years old, and you are in the realm of all sorts of things simply getting old - rubber perishes, upoholstery wears, plastic gets brittle, steel rusts, etc. You can expect to have to replace things like steering boxes, brake boosters, radiators, heater cores, alternators, all this sort of thing, unless it has already been done. And they have Lucas electrical systems.
The biggest concern is probably rust in the chassis and steel body parts, particularly the firewall or bulkhead. All of them leak water, so best look for one that has lived inland most of its life, as this will minimise rust. 
Both engines are low powered by 2015 standards, but are capable of maintaining highway speeds except in very hilly country. All of them ride and drive well, unless suffering from faults such as worn shockers, loose tie rod ends, worn suspension bushes etc. Many have had extensive modifications such as substantial lifts, oversize tyres etc, which are rarely justified, especially for your planned use, and have all sorts of drawbacks.  The Isuzu vibrates badly when idling, to the extent of loosening rivets, but is smooth and comfortable once under way. It is also noisy compared to modern diesels - but it is a truck motor, so what do you expect? Mine has just had its 580,000km service, uses no oil, starts instantly, and has never had the head off - the only reason the sump has been off was to replace the leaking sump gasket.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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