We use a tall (5 gal capacity Thedford Porta Potti) for both #1 & #2 during the winter months in Michigan etc and have for well over 30 years now. Takes 4-5 days to nearly fill the 5 gal potti waste tank and you can dump it in any toilet including a pit toilet. Never spill a drop or get a drop on your hands! Carries like a suitcase. Be sure to use a chemical and there's zero smell ever.
Most of our RV's I remove the OEM toilet during the cold months, takes about 5 minutes (2 nuts and unhook the water line and put a plug or on some I installed a simple plastic ball valve or a brass valve in the supply line to shut it off. How long does it take to remove 2 nuts and screw in a plug or a cap or turn a valve? Done!
I'd made an approx 4" - 5" high base riser that consists of a 2 X 4 on edge frame with a 1/2" plywood top having a 3/4" wood border nailed down around the top to assure the porta Potti can't slide around and painted it same color as the Porta Potti so it looks nice for the Porta Potti to sit on and it looks like it belongs there. It moves from RV to RV as wanted and it's over 20 years old now and still looks new as it was repainted only 3 years ago. The box brings the Porta Potti to the same heigth as the RV toilet was and covers the drain hole and hold down bolts. Any plastic lid will cover the sewer hole as you can't even see it and besides, there's NO sewage in the black tank anyway so no smells ever. If nervous, duck tape etc the plastic cover down or tape the sewer hole over with the tape. BTW, I don't like Duck Tape as it often leaves mastic particles when you remove it. I prefer Gorilla Tape, so much better! Never had the Porta Potti move around even a bit when traveling hundreds of thousands of miles over the many years in our various TT's, MH's, 5th wheels, or TC's.
In our state, the DNR allows you to dig a hole a min of 8" deep in the state forests a min of 300' from and campsite and away from a traveled pathway and dump the Porti Potti waste into it and then you must refill the hole with the same dirt and return the ground to it's previous look as much as possible. The only thing then that then goes in our gray tank is shower water and dishwashing water. Don't know about NY State or highly populated L. I. NY has some real goofy laws and I feel sorry for you.
A must to scrape off the plates and pans and even wipe food particles off the silverware etc with a paper towel before washing so virtually no food particles go into the gray tank to decay and rot and therefore there will be no smelly water or bacteria in there and you can dump it on the ground when back home. Can even add a cup of bleach down the drain or some toilet etc chemical to prevent odor. Throw NO food solids in the RV drains but rather in a plastic bag and twist tied or zip locked and into the garbage.
Remember that you'd used soaps/detergents/anti-bacterial soaps/etc in all the water that went into the gray tank so any bacteria would be killed anyway. Our gray water in winter comes out looking like fresh shower water even after 2-3 weeks of being in the tank and sure is clean enough to dump on the ground but NOT at the campsite as if most campers did it there would be a white soap scum build up showing appear in a couple years of doing it in one spot.
Just got to use that old noodle you have in your noggin and about anything is easy to accompolish. It's not rocket science!