Best is to talk on the phone, not emails. You can learn a lot through voice. Just plain tell him how you will not buy just bc you show up, that you will look it over carefully and take a lot of time to do so, and ask if he cares that you take hours to inspect, and ask again and again if there is any issues. All RVs will have issues, even new ones. Ask for the issues. If he does not know of any then likely he is either not knowledgeable at all or is lying to you to make a quickie sale.
When I sell I am probably in the minority. I state all known issues, all issues that I fixed, how I fixed it and issues that I just live with. Buyer might want to buy an RV with issues that he can fix himself to save a few bucks and know it is done right - that is my theory, and helps me sleep at night knowing I was up front...
Most sellers with issues will just list one sentence about the RV and say very little, and if you ask 10 questions they will answer the easy one and ignore the others bc he cannot answer without indicating there are issues. Run from those. Run from anything with water damage unless you can fix it. Run from water stains on the ceiling, or painted ceilings in spots. Look for repairs, which could be done right and better than new, or could be just masking a poor repair job.
Also know that there are RV issues that can be ignored and do not need to be fixed necessarily. Some rotten dry wood here or a broken thing there does not detract from the function or the integrity of the RV and might not ever matter until years after the RV has been tossed in the junk yard. Some issues do matter a lot though. You have to make that call.
Yes, you should b able to find something closer to you. Just be patient, tomorrow the one might show up in an ad in your town. Just keep watching.