Yes. Mike that is a great price and nice looking coach.
Having said that, I understand the OPs concerns of DP vs gas and more importantly "bang for the buck". We looked at our long term usage and this is why we decided not to go diesel. Diesel for the same year and ammenities was 75-150k more. Our usage is similar to the OP and we expect that we might live in it for 3 month tours but never go full time. We found a 2013Tiffin Allegro 36LA (gasser). We like that length and floor plan. We like our patio area. To get the same price point with similar ammenities, in a DP, we would have to go 5-7 years older and then the available "modern" amenities were slim or we would need to add more money, time and labor to updating the ammenities. At 7 years, unless the current owner had already updated, all electronics (stereo/TV/nav) would need upgrading. We tried buying into a lower coach with our first coach but found the upgrades we wanted wqas becoming very expensive to install/mod. That is another reason we chose the 36LA. It had 90% of what we wanted.
Floor plan was always numb er one for us. We really did not want a quad slide. Again, we have no intention of full timing. We do travel from Seattle to IL and Louisiana 2 out of every 3 summers. This means that travel comfort was important, as we do some long hours, but not the number one consideration. That is why we chose the Tiffin gasser over SOB. And maintenance is lower and easier on the gasser.
We are very happy with our coach. If we could redo something, we would get the same coach but with the RR, larger inverter and upgraded batts.
I understand the OP search and asking this excellent question. IMO DP may be a better ride but finding the right coach for type of use does not mean going right to a DP. Sometimes bang for the buck (which is my perspective on my disposable cash) is not worth it to everyone.
Good luck in your search.