We have a substantial amount of info on the workings of (and the info needed to repair) the Alpine Coach on our Owner's Association Tech Library site
and more coming, which makes Alpine way ahead of most orphans. Even the chassis multiplexing, which formerly had no OEM documentation at all, now has an Alpine-specific manual with all the pin-outs identified.
You will like the way it drives, and you will like that there is great help here on iRV2 for most situations that come up. Some people shop & shop, and then buy an Alpine because of the great help from fellow Alpiners.