to do it correctly you'd need to know the plumbing rules. and, if you take out the black water tank at some point i'd think you will sale the trailer and it won't have a tank...replacing it would probably cost $1300-2000.
i'd suggest just leaving the tank alone and figure out a dumbing schedule, i.e. every two weeks or so.
http://www.rvdoctor.com/2011/03/rv-holding-tank-removal.html
emoving tank could also cause smells.
eddie and sandie
3402 Montana 2013
Ford F350 2015