The 2720 (among others) comes with an optional 40-gallon tank, and I seem to recall it sits in the same place as the 20-gallon. So I would think it's just as easy as finding the right 40-gallon tank with the right dimensions.
But it is done regularly.
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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