Chris,
Sorry I don't have an answer to your question. When I needed to replace the
fresh water tank in my '60 Overlander I opted to have one custom made so as
to fit the available space. I think it cost about $200 but I no longer have
that receipt. Try a web search for RV water tanks. There are many standard
sizes that may work for you.
Most likely there is not enough room to get the gray water storage you want
within the belly pan because the frame will get in the way. Either you will
need to mount it beneath the pan, exposed, or inside the trailer (assuming
your drains are high enough to accommodate this.)
I would like to make an observation. It sounds like you will be adding a lot
of weight. A 40 gal hot water heater, a fresh water tank (40+ gal?), wash
water tank (50 gallons), refrigerators (I assume that these would be full
sized), a three basin sink, etc. Then you add cooking utensils, water and
any other furniture, food, etc. I believe that you will be over the designed
weight capacity for the trailer. Keep in mind, the frames, axles and tires
are only designed to hold so much weight. Even if you are starting with an
empty shell, I'm guessing you only have about 2000# to work with.You may
find that you exceed this before you add any water to your tanks or load any
food in the refrigerators.
There might be work arounds for the weight issue. Suggestions I have are:
New axles with increased capacity. Tires with the max weight rating
available. Dropping the belly pan and have a welder reinforce (and repaint)
the frame. Replacing the 40 gal hot water tank with an on demand tankless
unit, but chances are you will still have to watch the weight.
I would also suggest locating the heaviest items as near to the axles (or
slightly forward) as possible. When planning things remember that you need
to keep the weight distributed evenly from side to side. Tongue weight
should be 10-15% of the total weight (translated this means that there
should be just a little more weight located forward of the axles than there
is behind them. Airstream ran into problems when they added the gray water
tanks at the very rear of the trailer. The closer something is to the rear
of the trailer the more it bounces as it goes down the road. Airstream
started beefing up the frames after they started bending from the gray tanks
added in the 70's. And that was just for a few gallons of water.
I like your idea, I just don't want you to pour your heart and soul into the
trailer only to break a frame and crack it open on a road somewhere!
Scott
> My 64 Trade Wind conversion project ( from gross husk to shiny mobile
> kitchen
> ) is limping along in my spare time- scraped up the remains of the
> flooring
> and replaced with vinyl squares and coping around the edges; soon I'll be
> installing a 40 gal. propane H2O heater and 3 basin sink plus hand washing
> sink mounted on 1" square aluminum tubing, followed by Dometic fridges and
> butcher block work counters, plus plumbing and wiring, etc- not to mention
> polishing and prettying everything up with sheet aluminum panelling. Still
> need to source both fresh water tank and a 50 gal or so gray water tank (
> don't want to use toilet holding tank for sink water ) Any suggestions
> about
> sourcing these, pref. used? Any RV junkyards I need to know about? Chris
> Rollins South Amherst Massachusetts