From a recent post of mine..
I've got the upspec'ed 4.7 v8 available from mid 2008. Great engine lots of power and plenty of torque. I've towed a camp trailer, several boats and a jayco poptop. Whilst not as heavy as you may be going the 4.7 has done it with ease through various terrain and with bar, winch, AT, lift, snorkel, loaded roof,etc.
Fuel economy is always well under 20lt/100km (urban around 15lt) whilst towing and servicing is cheap.
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