Mick,
an interesting question! Everyone that has already posted is posing some very interesting points. I can vouch for one thing, the 130 is an excellent set up. As a vehicle it's very flexible with the 5 seats and the ability to carry a metric shedload in the tray, generally being simpler than the later model 110's gives it a very rugged quality, and to be honest it's not that big.
I'm fairly sure at last comparison my 130 was shorter than my mates Late model triton dual cab.
"So it has to be able to tow our camper trailer, cope with being loaded up with stuff, have a durable interior, survive being bashed around the worst roads in the country, not use too much fuel, have reasonable air con, be acceptably reliable and capable of cruising at up to 100 km/h for long distances. It should remain a viable vehicle for about a decade. It won't be used for commuting. In other words, we want a marathon runner, not a sprinter."
This sounds to me like you are describing a 130. ;) My td5 130 pulled 120km/h on the highway unladen in standard tune, but the remap etc was, as some have mentioned, the best thing I've done to it.
The 'electronics' in it are actually very robust and simple. I flooded mine, like water over the dash, water in the intercooler style and I can tell you, I just dried the ECU and some of the sensors, stripped the air intake, pulled the glow plugs and the injector loom, chuffed a little vapor out and I was back in business. I was exceptionally lucky, but jesus you wouldnt get away with that in some other stuff.
WRT the Aircon, Ive not got aircon in mine, but I reckon with the smaller cabin space of the 130 you might see some better results than a 110 in that dept.
The main question is money though. A quick search of carsales in QLD (as I see you are in QLD) turned up that most 2.4 and 2.2 110 or 130's are going for mid to high $30's, with some low km examples even fetching high $40's.
td5 models of either going for figures in the $20's generally. You get what you pay for I suppose but $10,000 will generally cover the list of 'Must have' accessories up to and including remapping with big intercoolers and exhausts.
Just something to consider.
The other interesting thing is there is currently 23 110's for sale in QLD and 5 130's. If you are a peasant like me, your bank account may end up making the decision for you, irrespective of everyone's advice. But also don't be afraid to catch a plane to go view one interstate that has what you need.
