Hi all, let me give my opinion here...
I have had a number of Patrols and have always loved them even have the number plate P47ROL, i am currently in a 2009 3lt with tune it chip, redback exhaust and fuel rail mods to try and pull out some extra ponies. I have alot of accessories also that add to the weight, from a stability and safety stanpoint you wont get better, there is not push pull around of the Patrol by the weight of the van, very stable and safe.
From a power and tow perspective its just not great, although they are rated at 2500 as the capacity i feel thats from an ability to handle the weight on the back rather than how well it moves from a speed and fuel efficency perspective.
I have towd the 16.49.4 up the Oodnadatta and all over the place but its slow going, very slow at times, i came back from Eden on Sunday and on some of the long hills that are noty that steep but have length i slow to 55-60 kph in 3rd gear revving at 4000ish rpm, it wants to kick to second but that just revs is nuts off, goes nowhere and places huge stress on a moter that is known to be temperamental and blow up! that pressure to tow increases the exhaust gas way to hot and the ECU trips out and it stalls at whatever speed your doing which is clearly no fun...
I had a shim put in the fuel rail to stop that but its a risk to the motor letting it work that hard. My fuel econemy was around 24-26 which is really bad, around town its 13-16 even thats fairly crap, cost a bomb in fuel.
I have spopken to many Patrol specilists, had it on the dyno, considered replacing the chip with the Stienbaurer one but at the end of the day there is only so much you can do to get more power and that always means compromise and risk to the engine...
After much heartache i signed for a STX Navara with a V6 diesel yesterday 170 KW 550 NMT, nothing more powewrful (x V8) The Nissan deals are massive at the minute, i crunched them down to $48,500 with mats, headlight and bonnet protector, window weathershields and tow pack, list price is normally $60,000.
i want to spend more time away and i just dont feel the patrol with the very old school antiquated engine can cut the mustard moving forwards, sad day as i love the live front and rear and the weight and bushability of the Patrol for our 4x4 trips but towing more that 1.2-1.5 Tonne is just terrible and cost a fortune in fuel.
All that said i have an awesome Patrol for sale!!!!!
Cheers and good luck!