I was amused to read that some people don't do all their business, both #1 & #2, in their campers toilet...
They were designed for just that use so go ahead and use them. Obviously you need to use T-paper designed for camping, we use Scott's single layer in ours, plus you need to add the chemicals that break down the solids but your system was designed for just that.
Some people are against doing #2 because they are not sure how to empty the black water tank at the end of your camping week or weekend. In case your not sure how to do this deed here's the way we empty our system.
1. Always keep the black water valve closed while camping. Never just keep it open as this causes the liquids to drain off allowing the solids to just sit and harden.
2. If you have full hookups at your camp site keep the gray water valve closed, or close it the day before you're leaving so you have lots of gray water to flush the black water nasty stuff down once you dump it.
3. When packing up to leave pull the black water valve and let it flow, lit flow, let it flow...
4. Once the black stuff is out close that valve and pull the gray water valve which releases the torrent of gray water to wash your hose clear of the black water nasty's.
5. Now that the black water and gray water tanks are emptied makes sure both valves are closed.
6. Go into your bathroom and dump in a bottle of chemical into the toilet and add about a gallon or so of water by just flushing it. This will prevent any solids that may be left behind from turning to concrete in your tank.
I have done my system flush like this for many years and never once had a problem, and yes, we do both #1 & #2 in the toilet as that's what its for...