Ok time to revive this thread! I know there are mixed feelings about diverting the nature's head urine tank into the Ollies unused black tank. Well, I actually went ahead and did this mod and so far FOR US we absolutely love it, more so for me not havig to dump and clean the 2.2gal urine tank every 2 to 3 days!š
Instead of using a ball valve to eliminate any odors from the black tank I used a 1.5" BV1B/UB HepvO Sanitary Waste Valve, and yes we still add some water and vinegar after every use, so there is no odour at all.
Obviously there are other ways to do this, and maybe a better way, but here are some pics of how I did it, pretty self explanitory so I will not go into much detail explaining it.
Next mod will be to reroute the sink drain to the black tank.
Large hole was from factory, I drilled the 3 smaller holes.