I am thinking about purchasing an '04 f150 supercrew 4x4...I tow a 19' Bayliner (often) and would like to get a pickup camper (if the bed is long enough). Anyone know if the '04 f150 will be capable?

 

All the specs are loccated with this thread some where.
You can also look for the FTE announcement on the truck.

I would say yes to the FX4 or the Lariat SCrew

 

Supercrew towing capabilities according to the new brochure for 4x4 with 5.4 and 3.55 rear would be 8200# and 5.4 w/3.73 = 9200# or if you get the 4.6 (should only come with 3.73 on the 4x4) it would tow 6500#. Subtract 500# off any max towing rate if you get 18" wheels.