I have a class c with a 30 gallon tank. I always carry 2 six gallon jugs and I installed a "drain" so I can drain my cooler into my fresh water tank. I have a large cooler that yields about 5 gallons a day so I rarely have to use the jugs.
I was looking to add extra fresh water capacity too. I have a 50 gallon tank and a pump I installed on our enclosed trailer. When we get low on water, I can refill the OEM water tank from the trailer. No extra load on the chassis that way. It also comes in handy for using our pressure washer at the races.
Serpexc wrote: I was looking to add extra fresh water capacity too. I have a 50 gallon tank and a pump I installed on our enclosed trailer. When we get low on water, I can refill the OEM water tank from the trailer. No extra load on the chassis that way. It also comes in handy for using our pressure washer at the races.
I've been looking into this as well. The post I'm quoting is pretty much exactly what I'm going to be doing. I'm also going to install a water pump on the enclose trailer so I can pump it from one to the other. I'll have a garden hose to screw on so, I can use it in other forms if needed as well. It's going to cost about $1000 for everything.
2001 Itasca Sundancer 31C
Towing a.......
22' enclosed trailer
2001 Banshee
2006 Polaris Preditor 50
2003 Chenowth Explorer TA
Your 31 foot Greyhawk (on an E450 chassis) probably doesn't have much extra weight capacity for carrying too much more fresh water, even if you can find a place to store it.
From a grey tank and black capacity versus fresh water capacity viewpoint, just add together the capacities of your grey and black tanks. You can add fresh water capacity to at least bring it up to the total of your grey plus black capacities. This is because your grey always fills faster than your black and you can keep off-loading your grey into your black until both are filled. Ideally manufacturers should design their rigs such that FW capacity always equals or exceeds their combined grey plus black capacity.
I wouldn't add FW capacity outside your MH's interior, as you want FW to always be kept above freezing in case you should ever want to dry camp for several days in cold weather.
You shouldn't add additional FW capacity behind your rear axle point on a Class C as long as you are thinking of getting, as the added weight back there may lighten your front too much so as to degrade handling and/or steering. Also, always add FW capacity LOW in the interior of your vehicle to keep high weight to a minimum so center of gravity stays low and side winds, curves, and passing trucks don't sway you more.
This means that if your rig can take a little more weight, add small FW tanks under dinette seats or in unused interior spaces such as under or behind the lowest drawers of the kitchen cabinets, or in behind the converter/charger area, or under the closets, or under the refrigerator. After you find the small containers that will fit into some of these otherwise wasted interior spaces, then you have to figure out how to fill and empty them. Once completed though, you may find yourself winding up with new FW capacity that matches or exceeds your combined grey/black capacity, added FW weight that minimally affects handling, and additional fresh water that doesn't freeze.
Here's some links to possible sources of potable-water-rated plastic tanks in all kinds of capacities and sizes for fitting into odd sized excess interior nooks and crannies:
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