[grubbyjeans]

Originally Posted by robertkennel

.....Ran vent higher than bowl water level so water would back up (if tank got completely full) into the bowl before going on to the ground...http://www.trailmanorowners.com/foru...2&d=1342586379......

I installed a vent line on my unit in much the same way as Robert.
http://www.trailmanorowners.com/foru...&postcount=121

Recently, while flushing my toilet during prep for storage, I caused an overflow of the toilet through the vent. It later occurred to me that if liquid passes through this vent arrangement, SOME of it will be left in the pipe because of the low section that is created as it is routed to the outside. It works just like a P-trap, which prevents sewer gas backup.

If you have routed the toilet vent in this fashion and you get liquid in there, be sure to blow the pipe out with air or it won't 'vent'.