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Helper Air bags for leaf springs, incoil helper air bags coil springs or do a coil to air bag conversion for coil springs. But not that much.
To properly increase suspension travel and lower it that much for towing a heavy trailer it sounds like you are going to need a mechanical engineer if none of the 4x4 off road guys know the right way to do this.
Most of the off road mud tire guys just hook up a trailer on their 40 inch tire lifted 12 inch suspension travel mud machines, cheat death (most of the time) and get 6 to 8 mpg, towing or not.
It could be done, I don't know how and I think reliability would suck and cost would be astronomical. Suspension and lift kit installs take all day, plus with that much lift you are likely looking at drive shaft changes too. There is nothing I know of that can do that much of a radical change in such a short time.
Sounds like you need 2 vehicles.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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