I haven't had to replace a tank yet, and truthfully, I hope I never have to... BUT...if I did have to replace a tank the first thing I would do is coat the tank with a sealer. Polyurethane, epoxy, vinyl, rubber, paint... something. The trick is to make a permanant barrier between the metal and the water. Hell, I might even consider having it Rhinolined like a truck bed. Once it's sealed your only consideration would be mounting it so it doesn't move.. and I would think that some foam or a few strips of glass could take care of that. 
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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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