They say i can sanitize the fresh water tank in my 78 but i was thinking of just putting a new one in then i know its safe to drink from. The previous owner didn't use the tank for years. So i'm unsure of how scumming it is inside & i sure am tired of having to waste space carrying bottled water when i could at least carry some in the tank. I think its a 6 gal. tank in my camper , but i'm not sure.I went dry camping for 2 weeks and used 20 gal. of drinking water between me & my dog.So i was wondering if anyone out there knows how big a tank i can upgrade to if i can? Will a bigger tank throw the camper out of balance or anything ? Can i put one in as big as the space under the seat allows or do i need to replace it with the same size tank? one more question any suggestions on where to look for the tank i'd need?

I imagine they're fairly "standardized", but I think I looked for one once (I forget why) and found they were a bit expensive.

Anyway, I'd do a Google search for "RV fresh water tanks". I wouldn't worry too much about going to a somewhat larger tank if it would fit. Increasing the tongue weight by a couple percent is not going to hurt anything as long as your tow vehicle can support the increase. And, since the freshwater tank is in the front, it will mostly effect the tongue weight.

- 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
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew

You can call Mantelli trailer sales and Steve in service or Jay in parts would be able to answer all your questions. (716) 625-8599. Maybe the price of a new one will make you want to sanatize the one you have. Let us know how it all turns out.

I would bet that you have a 20 gallon fresh water tank and a 6 gallon water heater. The 1977 brochure shows 20 gallons on all models.

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My Great Wife Joyce
2018 Jayco Jay Flight 21QB
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I don't think it would be too hard finding a replacement tank. Check the demensions of the old tank, keeping in mind you don't want it hanging too low. Depending on the location of your tank, you will add more water weight and therefore have to adjust where you place items inside the trailer to compensate for the extra weight.

rv fresh water tanks - Google Search

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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