I pull with a 1995 E-150 Econoline conversion van with the 351W, E4OD tranny and 3.55:1 gears. It does a good job pulling even though we top out at about 12,000+ pounds when fully loaded. It gets about 12mpg on the highway in pulling trim.
For trailers, think about a 16' minimum length, low-boy deck trailer with a 3' to 4' dovetail. Get good C or D load range radial tires on it if you plan on pulling any distance at all. Also get electric brakes on BOTH axles if you plan on going over the road.
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Jeff Chambers
T/S #4
12.028 Seconds/114.51 MPH
http://www.kellnet.com/chambers/default.htm