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you would have to either modify the brackets or redrill the holes, and it would only go up 3" and they still hang below the cab.
I would ditch the body lift...
The owner of this site (Chris) has a write up for putting a blazer tank in a truck.http://www.captkaoscustoms.com/blazertank.html
A rear tank can get bashed just as easily and side tanks! I know Ive bashed them both. My Blazer's tank looks like its been beat with a big hammer. I have bashed a pickup tank on a chunk of granite so bad is gashed a hole in it, never caught fire.