the 3.8 is just a bored & stroked 3.3, its a good motor, with a tiny bit more torque off idle compared to a 3.3
3.3 is more for a spirited driver (aka me )
& the Mitsubishi 3.0 is okay, if you like relying on a timing belt, & having a trail blue smoke following you everywhere, plus fixin' them all the time
it'll be fine towing that little pop-up
-greg