Buying Trooper Advice

I want to buy a used 4X4 Trooper with a V6 and manual transmission. I will want to tow a 2000 Lb. boat sometimes. Any advice on what to look for ? Problems or concerns ?
Can I make do with the 4 cyl engine ? Which is better ? What problems should I look for on a used Isuzu with about 100K miles ?

Head Problems on 2.6's they Crack when they get hot. Rust. Try engaging the 4X4 and roll arround in it listening for suspicious noises. What year truck are you lookig for?