"New" owner of an "Old" Travel Trailer question

Old 05-13-08, 07:33 AM
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"New" owner of an "Old" Travel Trailer question

Hi everyone, I am new to this site and I must say I have read a lot of very useful info so far.

We have just purchased a 1975 18ft TT which has a sink and a toilet/shower in one. We were told by the previous owner that we have only one holding tank where all waste/water will flow into from the sink and bathroom.

My question is how can we tell what the tank capacity is? I cannot find specs anywhere for this particular type of trailer (Sunset something?) and from what I have read we shouldn't empty the tank until it is about 2/3 full.

I do not want to have an overflow or any other mishap while camping for the first time with this unit.

Anyone with any advice I would welcome it.

Old 05-13-08, 10:35 AM
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My suggestion would be to crawl underneath the trailer and find the holding tank and measure it and then figure the volume of it.

Here is a calculator you can use once have the dimentions:


Last edited by Bullet670; 05-13-08 at 10:39 AM. Reason: added link
Old 05-13-08, 04:55 PM
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and no matter what size it is...it won't be enough for you to take regular showers and stuff in. be very conservative.

i always empty my holding tanks because bacteria cand and will grow even in the gray water tank...and it can stink pretty badly.

does your TT have a toilet? if it does, i think it has to have a separate holding tank for the "black" water.

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