2003 Komfort 21 Freshwater tank and Holding Tank Sizess

boosTT, don't you own a bucket? lol

Does it really matter? You already own the trailer at this point.

Yes, Artum, the old bucket method works too! lol

Fill your fresh water, then get two buckets, measure them. Start draining the fresh and fill up to your measurement, then switch. Dump that measured amount into the gray. Continue until either fresh is empty, or gray is full. Record measurement. Dump gray slowly into bucket, dump into black. Keep measuring until you know for sure. See how much you can put into black.

Usually fresh and gray are close, black is often less.

Try-

http://www.nadaguides.com/RVs/2003/Komfort/M-21T/4035919/Special-Notes

http://www.rvvaluesonline.com/Navigation.do?product=RVBB&yearId=2003&year=2003&manufacturerId=1467&manufacturer=KOMFORT+CORPORATION&modelId=75449&model=KOMFORT+TRAVEL+TRAILERS

https://www.rvtrader.com/New-Or-Used-Komfort-Komfort-21T-RVs-For-Sale---RVTrader.Com/search-results?make=Komfort%7C2276796&model=Komfort%2021T%7C764843868&sort=featured%3Aasc&radius=150&

http://www.etqualityrv.com/product/used-2003-komfort-21tg-583153-29

Unable to research. Nothing was available.

I found 56 gallons for fresh water. Seemed easy to find. What did your research show?

All the tanks on my 2003 22' Prowler is 30 gallons..

If you have access to them, you can get some basic measurements and compute it?

Good luck!

Mitch