I am talking about putting in a tanked toilet and ditching the RV toilet altogether. There are several reasons for this line of thinking: Everything made for RV/Trailers/etc. is so damned expensive and I live on a very limited income. Seals only seem to last a few years and the fact that there is no P-Trap to block odors drives me nuts. I live in California's corner of the Mohave Desert so the summers are a tad warm. Who would have thought that living in a metal box in the desert would be a bad idea?

Also, I kinda miss a real toilet.
I have been living in a 1983 30' Fleetwood Southwind since 2017 and I learned a lot about RV maintenance in that time. the first of which is don't hire someone to do what you can do. I thought that the parts were expensive but they are nothing compared to the hourly rate of the "professionals". Luckily I am handy with tools and not afraid to learn something new. Got off topic, I apologize for that. I am doing a complete refurbishment/update to my Alfa Gold and there are a few RV specific items that are on the endangered species list. Along with the toilet are the fridge and water heater.
I have been doing some toilet research and there are a few low profile thrones available that look like they will fit in the space. As far as the rough in, I was thinking that measurement would take the tank into account. There is not much room where the toilet is and behind it is a sliding door so unless I want to ditch the slider and frame up a swinging door 12" is all I have. All the rooms in the Alfa are so much roomier than in the motorhome except for the bathroom. The Fleetwood had the shower separate from the head so there was plenty of room in both. I can barely turn around in the Alfa shower. I am seriously considering removing the fridge and expanding the bathroom. I have a full sized refrigerator in the shed so I can actually go shopping.
I apologize for the long winded reply, I get excited when I start talking about the renovation and can easily get carried away.
Richard 5th