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Old 04-16-2008, 12:42 PM   #1
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Would this work?

I'd like a bigger black tank. I have this bathroom


Problem is, the black tank sits under the vanity and toilet, on the floor. There isn't room in there for anything bigger. Unless you go "below"...

problem there is that these fixtures are all tied together (shower, sink/counter, vanity, black tank cover), so removing the tank cover would leave you with a vanity that doesn't reach the floor. I'm not sure that I'm clever enough to build a new one.

So I'm thinking, why not just leave the tank cover (and its plywood underpinnings) in place, "as if" there were a tank there...and connect a sub-floor mounted tank to the toilet with a 3" extension pipe. Its a long drop...but so what?

I suppose I could cobble up a plywood box to tuck under the vanity, and use a full-height toilet mounted to the floor, insead. I'm just afraid that it would look "cobbled", compared to the custom-molded stuff that's there now.

thoughts?
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Old 04-16-2008, 01:34 PM   #2
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Questions...how is your shower tied into the same tank if the bottom of the shower pan is at the floor level and the tank is above the floor? 1973 - Do you have a grey tank?

I have a couple of thoughts...but need to understand how your tank(s) work now.

Shari
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Old 04-16-2008, 01:47 PM   #3
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no grey tank.

thats another subject, entirely.
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Old 04-16-2008, 03:05 PM   #4
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Okay then...could you just make the black tank taller? Go DOWN from the floor and suspend it into the frame above the belly pan (or below)? That way you would still use the space above the floor in the platform AND make the tank bigger by going below. My thought is that it could be "open" right below the toilet to connect the two tanks - not just a connection tube which could get "clogged". You would have to somehow support the suspended tank...but that could easily be down with strapping of some sort..

Shari
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Old 04-16-2008, 03:10 PM   #5
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are you talking about 2 tanks? or one big one...with a large cutout in the floor? I don't think putting a huge hole in the floor that close to the back of the trailer would be a good idea. there'd be nothing to connect the shell to, for one...and since the floor is "structural"...
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Old 04-16-2008, 03:17 PM   #6
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No, I'm thinking of two tanks the same size, one above and one below the floor with an "oversized connector" right below the toilet between them. Kinda like a "C" or sideways "U" shape. You would probably have to use a wand to clean the "shelf" under the sink part (if it's not sloped)...but that wouldn't be a big deal in my opinion.

Make sense?

I agree, a single tank would compromise the floor too much.

Shari
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Old 04-16-2008, 03:48 PM   #7
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hmm...well, thats interesting. So...just leave the existing tank, and have it dump into a "sub-tank". LOL! Convenient that this particular setup is a "bottom-dump". the dump goes straight down through the floor; not out the side, like on most trailers.
I'll see if I can find a pic...
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Old 04-16-2008, 03:50 PM   #8
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Quote:
Originally Posted by Chuck
are you talking about 2 tanks? or one big one...with a large cutout in the floor? I don't think putting a huge hole in the floor that close to the back of the trailer would be a good idea. there'd be nothing to connect the shell to, for one...and since the floor is "structural"...
Use caution when adding weight to the rear end.

Your trailer is subject to the "rear end separtion" problems.

Your two tank setup would work, or a larger tank could be used, but you would have to modify the rear end, so that the shell would have a much better control over the frame.

If not, then rear end separation, for your trailer, would be a "guarantee."

Andy
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Old 04-16-2008, 03:51 PM   #9
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Chuck.... I would just drill a 4" hole through the floor and you know have a portable potty. When it gets a little smelly under the AS just tow to a new spot!
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Old 04-16-2008, 04:15 PM   #10
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Originally Posted by rickandsandi
Chuck.... I would just drill a 4" hole through the floor and you know have a portable potty. When it gets a little smelly under the AS just tow to a new spot!
Daring advice, coming from someone next to whom I am likely to be parked at future rallies.

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Use caution when adding weight to the rear end.

Your trailer is subject to the "rear end separtion" problems.

Your two tank setup would work, or a larger tank could be used, but you would have to modify the rear end, so that the shell would have a much better control over the frame.

If not, then rear end separation, for your trailer, would be a "guarantee."

Andy
I'm hip. But, included in my diabolical plan is the following:

(its only a 23 footer. Have you ever seen separation on a trailer this short? )

still, I plan on using your suggestion of adding angle-irons welded to the outboard of the main frame rails, and bolting to the floor, for extra support.

PLUS, I won't be driving around with it full. not as a matter of routine, anyway. a larger, but empty tank back there shouldn't be significantly heavier than what is already there.

PLUS, I promise to buy new axles, first.

AND I promise, I'll balance the running gear.

there's a pic that shows the location of the original dump valve here: http://www.airforums.com/forums/232428-post7.html

I just thought of why this won't work. (the 2-tank idea): black hills. the dump outlet on the existing tank is NOT directly beneath the toilet. Oh, well. back to the drawing board...
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Old 04-16-2008, 04:16 PM   #11
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Quote:
Originally Posted by Chuck
hmm...well, thats interesting. So...just leave the existing tank, and have it dump into a "sub-tank". LOL! Convenient that this particular setup is a "bottom-dump". the dump goes straight down through the floor; not out the side, like on most trailers.
I'll see if I can find a pic...
Basically, that's what I was thinking...seems like if the support & frame issues are addressed with consideration of the added weight it would work. Sounds like it'd even be simpler because of the bottom dump valve on your existing tank.

Quote:
Originally Posted by Chuck
I just thought of why this won't work. (the 2-tank idea): black hills. the dump outlet on the existing tank is NOT directly beneath the toilet. Oh, well. back to the drawing board...
That's why I suggested a "oversized connector" hole between the tanks...maybe elongate your dump hole you have now (eeewww...that sounds baaaad!) to make it better align with the toilet. No reason I can think of that it has to be round...

Shari
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Old 04-16-2008, 04:37 PM   #12
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yeah...I'm not thinking that's a likely scenario. . maybe add a second connector. Still sounds potentially messy. And more and more like modifying the vanity cabinet would be easier.
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Old 04-16-2008, 04:48 PM   #13
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This may be a bit radical - add a second tank in the belly pan somewhere forward of the bath area - install a 12-volt macerator pump between the two, then whenever the tank in the back gets full, flip a switch and transfer it forward. Sort of like a grinder pump on a house where the sewage has to go uphill (which is definitely against conventional thinking). It means having to clean two tanks at the dump station, but also fewer trips.
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Old 04-16-2008, 05:01 PM   #14
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yeah, that IS radical. really, there's not that much room. I kinda like the idea of using "gravity" to empty the tanks...in my experince, it almost always works. electrical devices...not so much.

but along the same line of thought: what you could do is leave the existing setup, valve and all...add a tank underneath, with the existing dump tube emptying into it. Leave the dump valve closed. when the existing tank fills, pull the dump handle to transfer the contents into the sub-tank. Then close up the valve, and start again.
wait...no, then you'd have a venting problem. this is getting silly!
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