Best tow vehicles are turbo diesel 4WD's, they are not cheap to buy though.
I tow a 3.2 t boat with 100 series 4.2lt turbo diesel landcruiser, no probles at all, I had a 80 series landcruiser turbo before that, again excellent tow vehicle. They will provide you with a resonable fuel ecconomy as well . I use about 15-18 lts per 100km , the same landcruiser towing your 180sx ( should be about 2 t) will return about 13-15 lts per 100 km .
Don't be tempted to use petrol 4WD's , they will send you broke on fuel (25-30 lts per 100 km).
The commie will tow in either 6 or V8 form and so will the falcon ( better than the commie because it has leaf rear springs ). the problem with these car type utes is that the tow bar is bolted on sheet metal so you always worry if the tow bar is still there, especially if you use a weight distribution hitch and you should .