Indio, a frequent poster on the IRV2 Alpine Coach forum and a member of the Alpine Socal group, has installed a keyless entry keyfob system on his Alpine Coach. He has it tied into his alarm system, and the lights so that they flash to confirm that the door is locked.
Talk to him nicely, and I am sure he will share his experiences with you!! He did tell me that it was one of the most complicated projects he has attempted. I saw the finished job, and he did an excellent job.
He might be traveling, so I am not sure how soon he might see your post.
'04 Alpine Coach 36' MDDS