Look carefully at your trailers tongue. Chances are you'll see that it's not welded but rather it's bolted to the rest of the trailer. Reason being is they (the trailer makers) expect people to have to make adjustments, plus welding galvanized is a pain and destroys the rust resistance of the metal at the weld site. So your easiest (and cheapest) option is simply to get a longer length of the same size galvanized rectangular tubing that's there already, unbolt your present tongue, measure and drill holes in the new tube (using the holes in the old tube as a guide), and then just install the new tube. It's almost harder to type it out than to actually do it.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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