you guys are awesome. my 1990 i spent probably close to a 1000 hours on updating and changing. it is fun, but a lot of work. i still have things i want to do, but am waiting till it cools off here.
as for the cameras, try
www.rvcams.com and call and ask for tim. he is great and his products are topnotch. my side and rear camera are all on a single monitor and it works great.
i did all the AV upgrades as well. hdmi distribution, svga over cat5, etc. it is fun.
enjoy the journey as much as the finish....or in my case, i dont know if i will ever finish my camper
later
tom