cancel
Showing results forย 
Search instead forย 
Did you mean:ย 

Holding Tanks

Calicajun
Explorer
Explorer
We were at Camping World looking at Columbus and Columbus Compass 5th wheels and liked what we saw on the lot. The only thing that worried me were the holding tanks. There seem to be bowing out under the unit.

Most all units we have looked at the under belly is flat but these units seem to bow down about 5 to 6 inches.
One to the units we looked at the under belly cover was torn so I could see one of the holding tanks. That tank was bowed on the bottom which was causing the pushing on the under belly covering.

No, I did not tear the under belly. Figured it was probably torn in transit but gave me a chance to see more of the underside of the unit.

My question is are holding tanks rounded on the bottom or are they suppose to be flat?

Thanks,
Craig
2014 Heartland Wildness 2775RB, 2015 Ram 2500 4x4 Mega Cab
8 REPLIES 8

Calicajun
Explorer
Explorer
No reply from Columbus yet but I will keep checking.
Maybe Columbus will have a rep at the LA RV show this October 7-20.
2014 Heartland Wildness 2775RB, 2015 Ram 2500 4x4 Mega Cab

MikeinSA
Explorer
Explorer
laknox wrote:
MikeinSA wrote:
Well this is timely :). We full time in a 2016 Columbus F375RL. We've been really happy with it so far, and have only had a few easily fixed problems. I've been dumping the black tank about once a week, and actually noticed a big bow under the black tank a few days ago. It's definitely the black tank - we have a clear section at the start of the drain line, and I can see the sludge flowing when I push up on the bow. I was going to call the factory this week and see if this is a warranty item. I'd say the bow is about what you saw 4" to 6", and doesn't go away after dumping. Let us know if you hear back from Columbus and I'll do the same.


I'm surprised that you can see the tank, given that the vast majority of RVs have enclosed bellies. :h

Lyle


Sorry, guess I wasn't clear. I can't see the the tank. The bulge is in the coroplast underbelly liner. I know it's the black tank because I can see it discharging when I push up on the bulge in the liner.
2016 Arctic Fox 811
2016 Ram 3500, Cummins/Aisin, Mega Cab, SB, DRW

laknox
Nomad
Nomad
MikeinSA wrote:
Well this is timely :). We full time in a 2016 Columbus F375RL. We've been really happy with it so far, and have only had a few easily fixed problems. I've been dumping the black tank about once a week, and actually noticed a big bow under the black tank a few days ago. It's definitely the black tank - we have a clear section at the start of the drain line, and I can see the sludge flowing when I push up on the bow. I was going to call the factory this week and see if this is a warranty item. I'd say the bow is about what you saw 4" to 6", and doesn't go away after dumping. Let us know if you hear back from Columbus and I'll do the same.


I'm surprised that you can see the tank, given that the vast majority of RVs have enclosed bellies. :h

Lyle
2022 GMC Sierra 3500 HD Denali Crew Cab 4x4 Duramax
B&W OEM Companion & Gooseneck Kit
2017 KZ Durango 1500 D277RLT
1936 John Deere Model A
International Flying Farmers 64 Year Member

MikeinSA
Explorer
Explorer
Well this is timely :). We full time in a 2016 Columbus F375RL. We've been really happy with it so far, and have only had a few easily fixed problems. I've been dumping the black tank about once a week, and actually noticed a big bow under the black tank a few days ago. It's definitely the black tank - we have a clear section at the start of the drain line, and I can see the sludge flowing when I push up on the bow. I was going to call the factory this week and see if this is a warranty item. I'd say the bow is about what you saw 4" to 6", and doesn't go away after dumping. Let us know if you hear back from Columbus and I'll do the same.
2016 Arctic Fox 811
2016 Ram 3500, Cummins/Aisin, Mega Cab, SB, DRW

Calicajun
Explorer
Explorer
Sent an e-mail off to Columbus. Guess I will have to wait and see what they says about their holding tanks. I will update this thread when the reply comes through to my inbox.
2014 Heartland Wildness 2775RB, 2015 Ram 2500 4x4 Mega Cab

Memphisdoug
Explorer
Explorer
I'm just guessing but if the tanks look bowed when they are empty then they are probably molded that way. I wouldn't think that the empty weight of a tank would cause it to bow no matter how little support it had.
2006 Silverado 3500 Crew Cab
2006 Crossroads Paradise Pointe 36RL

boogie_4wheel
Explorer
Explorer
The bottom of my waste tanks are rounded and sloped toward the valves so that they will drain when the trailer is level.
2005 2500 Cummins/48RE/3.73, QCLB, 4wd, BigHorn, Edge Juice w/ CTS + Turbo Timer,Transgo Shift Kit ISSPro Oil and LP pressure gauges, GDP 20/2 filters, Custom Diesel Steering Box Brace
'10 Forest River Shockwave Toy Hauler 21'
Honda EU3000I Genny

Old-Biscuit
Explorer III
Explorer III
Waste holding tanks (and fresh water tank) are FLAT on bottom so they will DRAIN

Bowing tanks........new units..........not even used yet just means poor factory install-----lack of proper supports so tanks will most likely fail (fall down when filled or fall out during travel


Pass!
Is it time for your medication or mine?


2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31