The 5.12s are going to be a big help, but it's still a ~60 HP engine,
even with the gearing advantage there is a little thing called rotating
mass, the heavier the tires and wheels, the slower the acceleration.
Think of it as a heavy flywheel on an engine, it takes longer for the
engine to rev.
A clean truck on 33s, you can always put in a 1.6 in the future, but to
pull a wood wagon, yah, it will do that