Great for towing I have one. Do put some weight like a bale of shavings in the back over the back axel and fill the diesel tank up, then they tow much better. This is just because they are designed for a 1 tonne payload, the back suspension is softer and there is otherwise no wieght on the back wheels.
not bad at all for towing, BUT, they have a terrible turning circle (think like turning a ferry round). makes it very difficult to reverse the trailer etc.
I borrow my brother's towing and it goes no problem. It is thirsty tho - he switched his for the petrol version and converted it to LPG. Tows great still just cheaper to run. He does use it for work tho and covers a lot of miles.
I'd heard this (bad turning circle) about the old style Mitsubishi's not sure if the new 'boat' shaped ones are any better?
We also have a newish Navara, and it's great for towing, fairly economical (average 32 mpg on diesel, but not sure about whilst actually towing cos I've never been that far!) I think my only gripe with these type of vehicles is they are so bloomin big! A pig to park at the supermarket and not very easy to manouver with the trailer on as it's so long. But I usually drive a regular car so maybe that's just me!!
I loved mine, I had an 03 plate and towed a HB510 with 2 klarge horses, it is thirsty and it has a large turning circle and it makes a long towing combination, I drive a lot of pick ups and 4x4's through my work as I'm in Agriculture, the pick up in it's design is light behind and can be a bit 'swimmy' when it's not loaded. If you don't need a pick up (remember there would also be VAT to pay if your not VAT registered or it hasn't been paid already), I would consider looking at the Nissan Terrano or similar types instead,
Friend has one & it does have trouble with the heavy trailer (richardson). An ifor williams should be fine as they weigh nothing, but make sure its not a heavy like an equitrek. They have had a lot of recalls on hers, so make sure all the work/faults have been done.