I'll live with the 26 gallon tank
I looked into replacing the tank last year. While I can't remember what manufacturer I looked at, I do remember that to buy one was an $800+ adventure; plus my time (and aggrivation-experience shows that things rarely go as the instructions say they will) involved with replacing the current one with it.
When towing, the 26 gallon tank will get me at least 200 (and most often more) miles. That's roughly four (or more) hours of driving. By then, it's time to potty anyway so I take care of both needs in one stop. At currrent diesel prices (over $4.00/gal here), a refueling stop is in the neighborhood of $100.00 for me. If I had one of those large capacity tanks, it would probably make me cry. Here at home, a tank of fuel lasts me a minimum of two weeks unless I've had to make some unplanned trips.
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TV: 2009 GMC Sierra 2500HD | Crew Cab | Std. Box | 4WD | Duramax/Allison
RV: 2000 Jayco Eagle 266 | FBS | TT -- 1986 Coleman Laramie pop-up -- Still in the family!!!