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Old 03-24-2018, 12:13 PM   #1
2 Rivet Member
1966 20' Globetrotter
Tacoma , Washington
Join Date: Mar 2018
Posts: 43
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Tanks on 20' 1965 Globetrotter twin?

Hi all,
We have returned as Airstream owners after a 25 year absence, and I'm just getting to know our newly pruchased 20' 1965 Globetrotter Twin. My understanding from the previous owners is that it has a combined grey/blackwater tank of approximately 10 gallons and a fresh water tank of around 30 gallons.
Questions: (1) Do those capacities sound about right?, (2) Is there a relatively inexpensive way to increase the grey/black water capacity?, (3) Any advice on installing a tank monitor system, like the SeeLevel? Thanks in advance for any help you can give me.
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Old 03-24-2018, 03:29 PM   #2
Rivet Master

1972 25' Tradewind
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McHenry County , Illinois
Join Date: Jul 2003
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Welcome to the Forum.

The tank sizes are about right.
The Airstreams of this Vintage technically only had the black tank. The grey water was intended to be drained into a gopher hole or a portable tank sometimes referred to as a Blue Boy due to it's color.
I my '67 GT had a similar set-up as yours. You have the shower. The '67 had a bathtub. It was possible to use the black tank to catch some grey water by opening the dump valve. However this only caught a few extra gallons before backing up into the bathtub. I suspect you will have the same condition.
There are several threads about adding a grey tank to Vintage trailers. Use the Google search function on the toolbar. I don't see a problem adding sensors when the floor is out and the tanks are accessible.

I currently use a 12 Gallon Thetford portable tank with the Tradewind. Look for a cap to fit on the waste collector by the dump valve with a hose fitting. Vintage Trailer Supply has the cap and various tanks to retrofit the older rigs. Most RV dealers will have the portable tanks.

Good luck,

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