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Old 07-19-2012, 02:17 PM   #15
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1973 31' Sovereign
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Team, I think we may be in the process of hijacking Gamakai's thread, not sure, as I have misplaced my official Forum user handbook.
Gamakai, I hope we haven't sidetracked you.
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Old 07-19-2012, 03:01 PM   #16
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My apologies if we have veered off track. To get back on topic, I would reiterate that adding a grey tank to a 70's era GT isn't terribly difficult, and that if one chooses the VTS tanks, they fit nicely inside the frame as pictured above.

Some modifications are required, namely, one must devise a means of support for the tanks, whether it is straps or slide in panels like I am using. I also made slight mods to two cross members so that drains could pass from tank to tank as low as possible. The center belly pan is one continuous sheet from the rear bumper to just behind the fresh tank. One option may be to remove it and then put it back all in one piece, another would be to create several sections of belly skin, as I did.

When I started working under my trailer, I stacked some 2 x 12s under the wheels to raise the trailer 3 inches to give me some more working room. I also got an angle drill, which was helpful for drilling out the rivets in the belly pan. Get ready for all kinds of nasty to fall in your face as you work.

Good luck.
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Old 07-19-2012, 09:09 PM   #17
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Another thought on the level of difficulty of adding a grey tank: no matter what tank you choose, at some point you will have to order the tanks and possibly specify locations for drains/ fittings. Some tanks are constructed such that you can drill your own hole where you need it and put in a rubber fitting, and away you go. On most polyethylene tanks, your best bet is to spin-weld fittings into place. For the VTS tanks, you can have VTS spin weld the fittings in for you, but you have to be very confident of where you want them to be. I actually constructed faux-tanks the same size as the VTS tanks out of insulating foam so that I could play around with them and figure out exactly where I needed them and where the drain/vent holes ought to be spun in. This worked out quite well. I have heard of other people ordering the tanks with no additional spun fittings, and they decide where they want the fittings and then take the tanks to a local RV place and have the fittings installed. So again, its a custom job, not really an off-the-shelf solution, so it takes some careful planning (to order your tanks with the fittings in the right place).
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Old 03-08-2018, 03:15 PM   #18
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old thread new question

Do you have to open the floor of the trailer to install these tanks or can you go in from the bottom? I realize you will have to access the drains into the tanks from above. which is preferred drain grey into black and then out, or separate exits for both? Thanks John
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Old 03-08-2018, 07:48 PM   #19
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A 71 Globetrotter that doesn't need much work is a rare trailer indeed. Airstream archives shows the 71 with a rear bath, above floor black tank. I wonder if the sewer hose connection is on the bottom and pointing down at the rear of the trailer like my son's is. This is not a the handiest.

I think all modern Airstreams have below the frame rail sewer connections, usually, but now always, behind the wheels. As mentioned above, some folks like the skinny tanks between the frame cross members, and some hang a larger tank to drain below the frame rails out the side. Here is a photo of my 86 sewer connection, and a photo of an 05 single axle Bambi Airstream with a very low sewer connection.

I like tanks that look like a "T" so they can be hung from angle irons. I like to drain them below the frame rails and out the street side of the trailer.

To install a gray tank under your Globetrotter, you will need to drop the belly pan and insulation, figure the best frame bay (between cross members) for the gray tank, figure a mounting method and a drain manifold with blade valve. Then you will need to plumb ABS piping from the galley sink, shower bath, and bath sink to the new gray tank. You will also have to figure a vent for the tank. Yep, it is a significant project. I'm installing a new gray tank in my 75 Overlander this winter. I'm almost done with that project.

David
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Link to my 1975 Overlander Improvement Journal:
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