20 gallon is the standard tank size. Some TMs have an optional 2nd 20 gallon tank for a total of 40 gallons. 30 gallons could possibly be the total water on board counting the 6 gallon water heater, the 20 gallon fresh water tank and the associated plumbing. The older TMs had a 12 gallon tank standard.
MJL
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Mike Laupp
2013 Jayco Eagle Premier 351RLTS 5er - Honda 2000i x2 w ext. run tank
2017 F350 King Ranch ultimate CCLB SRW 6.7L V8 TD Fx4 BakFlip F1 & BakBox
TM History: '97 2720, '02 2720SL, '03 2720SL, '04 3326K. 2001 - 2012 yrs owned.
1990 Isuzu Trooper II 283 V6
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