How can I find out how many gallons my fresh, black, and grey tanks hold?

Thank you,
Cheryl

It's in the manual I believe. If you don't have a manual, you could always measure what you put in to fill or measure what comes out of a full tank.

My 2007 17ft HiLo has 36 gal fresh water (includes 6 gal water heater), 30 gal grey and 17 gal black. Those are fairly standard sizes in the later models.

- Jack

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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System, SoftStartRV mounted on A/C
2024 F150 Platinum FX4 3.5L PowerBoost SCrew

On mine the black and gray are switched, I have a bigger black tank.

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2016 Toyota tacoma TRD sport
Classic 2693 RD
Luke 1:49

Cheryl,
It is listed in the brochures.

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"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas