Pioneer does have camera input, but, if you have three cameras you will have to use the switchbox that is in your coach. Most of the Pioneer radios only have one input, the Thor cameras use a 5 pin connection, the Pioneer usually has an RCA connection. If you use the swithbox from Thor it is set up to trigger the side cameras with turn signals and has an RCA output.
This is what the switchbox looks like if you have one:
Thor Forums
