Anyone ever put an extra gray tank under the truck?I removed all my holding tanks, and will not use them til I re-sell it. They block too much, the spare tire thing, the license plate, the air bag valves and the trailer hitch.I usually boondock and can drain gray to ground, but sometimes need a small tank. I dont do toilets.I have room under the Ram passenger seat for a decent size tank. A garden hose will suffice to get it there.

I have thought about installing a "saddle tank" under the sides of my truck so I could transfer waste without taking the trailer anywhere. Seems like it would work.

To answer your question: Look at mounting a 6" or 8" pvc pipe about 5' long from the hitch or even in a hitch cradle. A 6" piece 5' is about 4.8 gallons. My father had an 8' piece mounted under the wing of our old Franklin for the kitchen sink.But if it was me, I would do the following and use the camper tanks:Spare tire cable retractor can easily be fixed by rotating 90* so it can be accessed from the wheel well. just have to remove 4 small bolts, rotate and then re-install.License plate usually isn't really blocked since it can usually still be seen when sitting in a vehicle 3 vehicle lengths behind the truck. My tag has never been real easy to see since even my father's old Franklin, but I've never been stopped by the police except when I pulled out too close in front of one so had to get on the throttle and released so much soot he had a black cloud to drive through.Air bag valves can easily be relocated. They are usually plumbed to behind the fuel door to give them a little protection.

If you live where campers have a license plate, the truck plate doesn’t need to be visible, same as when towing a trailer. On my previous campers that had the tanks hanging below the rear I put a piece of 2” thick 4’x8’ rigid foam insulation under the camper to buy a little extra room. I towed a large trailer with the tongue extended to reach the truck under an 11.5 camper without using a hitch extension and it looked fairly tight but wasn’t ever a problem. As mentioned, spare tire crank can be reoriented and air bag fill valve are easy to put anywhere, I used to have them inside the gas filler door. But - a far better way is to drop the couple hundred $ on an onboard air setup for your bags. It’s very handy to be able to fill and dump air at will, anytime and anyplace.

thanks, but I use camper too much, and will take it on and off too much to bother with additional hassles. I dont have interest in moving spare tire thing, air valves or even moving the license plate each time. If you had any idea how much effort I spent just renovating the camper you understand. TCs are way too complicated to attach as it is. (with my trailer the biggest hassle was wiggling the plug out of the socket).I know 6 inch pvc pipe is supposed to exist, but I have yet to be able to buy one. I dont know if I have the room for that length pipe and still have 4x4 clearance. Would a long pipe tend to slosh the waste back up into the shower pan on hard accelerations uphill?Sidehill, interesting to just put a tray under there. If I were not towing at the same time that could work.I thought about a tank on drivers side at the rear, where original black was anyway, not blocking anything important, but I dont want to have to drill holes to hang something. I need to keep it pristine under there for when I re-sell and put the stuff back together. It is a fiberglass shell. But , maybe I can make something to attach to the hitch extension. Will render that

Gray tank under truck | Good Sam Community

13 Replies

SideHillSoup
Explorer
Jan 23, 2019
kohldad
Explorer III
Jan 23, 2019
To answer your question: Look at mounting a 6" or 8" pvc pipe about 5' long from the hitch or even in a hitch cradle. A 6" piece 5' is about 4.8 gallons. My father had an 8' piece mounted under the wing of our old Franklin for the kitchen sink.

But if it was me, I would do the following and use the camper tanks:
Spare tire cable retractor can easily be fixed by rotating 90* so it can be accessed from the wheel well. just have to remove 4 small bolts, rotate and then re-install.

License plate usually isn't really blocked since it can usually still be seen when sitting in a vehicle 3 vehicle lengths behind the truck. My tag has never been real easy to see since even my father's old Franklin, but I've never been stopped by the police except when I pulled out too close in front of one so had to get on the throttle and released so much soot he had a black cloud to drive through.

Air bag valves can easily be relocated. They are usually plumbed to behind the fuel door to give them a little protection.
ScottG
Nomad
Jan 23, 2019
I have thought about installing a "saddle tank" under the sides of my truck so I could transfer waste without taking the trailer anywhere.
Seems like it would work.

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Gray tank under truck

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