I thought it was a no holds barred ultimate tourer and weekend warrior
Anyway, I think my fuel economy may be better than kj69 as I run 4.56's as well but a taller tyre. As an aside I also tow a trailer, actually my teardrop camper. Economy drops but the treardrop with the rooftop tent on it as well has a bit of drag but it does sleep 7 (if I wanted to but we normally have 5) and I dont even think it drops to worse than 18.2, never got worse than that on a road trip.
For straight out touring and getting around Aus 31's would be fine, but as a weekend toy bigger is better
So I say 33's would work nicely although with 4.5" lift and bushwackers you'd fit 35's if you wanted to and you'll have to cut for 33's anyway.
Cheers
Steve