Welcome to the forum. This thread is a great place to start. As far as the warranty, as long as the coach has not been previously titled, it is “new” and the warranty starts the day you buy it. I bought a three year old coach that had been tied up in a dealer bankruptcy and it still was “new”. For the upgrades, if you are buying from a local dealer, the might agree to do the upgrades you listed - if you agreed to pay for them, but most dealers do hot seem to want to perform major mods.
Many people have done the mods you listed and have been very happy with the result. Others of us have not modified the suspension system at all and have not had any problems. I have driven a Vegas and an Axis over 65,000 miles - including a 14,000 mile trip to Alaska - and have not seen the need for the mods. Just one man’s opinion.
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