295/75R22.5 should be the stock tire size from the factory for your 2000 Executive, so you should be all set to go.
We went with the Toyo M144 tires as they were the overwhelming favourite recommendation we came across on the forums. In fact we couldn’t find anyone who had one bad thing to say about them. In case your mind isn’t made up yet, the price and value is hard to beat. Over 2 years on them and we love them.
Side note, if you were considering changing tires sizes you will need to check the load rating tables for the tires to make sure they can handle the axle ratings and weight of your coach.
Reference: 2000 Executive Brochure - https://www.monacocoach.com/resource...27_brc_pdf.pdf
All the best!