Welcome to the
REAL world of motorsport. 4WDs are all about parking on RX-7s and Supras
First up, have a read here:
http://www.offroadexpress.co.nz/modules.php?name=Forums&file=viewtopic&p=10828#10828
Its a bit of an intro to a few things you can do and how to do them.
Also, The Hilux Surf is the station wagon version, and the Hilux is the ute version - theres no hilux surf double-cab

- well, not one I've seen anyway. A double cab would be a good starting point because it has a solid front axle, which is a far better offroad system than the IFS front suspension that the Surfs have in that year. Also, its easier to:
fat-boy wrote:be high as f**k beyond the point where i need a ladder.
Ok, a few facts about lifts:
With leaf springs, anything over 3" or 4" or so in a Hilux will probably be poser value only - the springs are probably going to have too much arch, and be too stiff to do any decent flexing. Higher is not always better. A system that combines flexibility with looong travelling shocks will outperform it offroad. Or are you looking for something that can park on RX-7's and Supras?
Big tyres = big dollars. Expect to pay $400-500 each for good 'big' tyres (35-38"). You'll find this is likely to be the single biggest expense but the single most worth while thing you buy. Ask around here before buying them... there will be some good advice depending on what you want to use the truck for.
The other thing that can suck money is an engine conversion - big tyres need to be turned, and a 2.4 diesel will struggle... a 2.8 won't fare much better. They will turn them... just slowly

LT1 350 Chev V8s, 3.5l Rover V8's, 1UZ V8's, 2JZ 6-cyl's, 5M and 7M 6-cyls... these are all good transplant options for a Hilux - each with ups and downs mechanically and cost-wise. Have a look at
http://www.4wd.net.nz for some good gen on probably the simplest and cheapest power plant upgrade for a 'Lux.
Hmmm... thats probably enough to confuse you at this point... keep reading, and keep asking questions. Oh, and go buy that 91 d-cab...
Steve