Newer Roadtreks come with a macerator waste pump. Here's how you can put one in the 4" pipe on your Roadtrek.

I got the idea from RV Sani-Con. More info here:
http://www.emptythetanks.com/road-trek-rvs-install.html

re: the Empty_the_Tanks installation method, I suggest drilling a few drain holes in the bottom of the 4" black pipe to make sure you don't flood the pump if your installation leaks. The outer end of my black pipe has a raised inner lip; 1/2" or more of water could accumulate in the pipe without drain holes.

Basically, I used their idea with a few differences. I only need a flat head screwdriver to remove the pump if necessary.

Here's what my first try looked like:


The hose attachment was in too far. It was hard to reach.
So, I made an elbow adapter to make attaching the hose easier.

Pipe up:


Pipe down:


Elbow:


Elbow in travel position:


Under Van Clearance: