How many of us are there? Owners of Dodge based RV's?

Seeing a post on here about seatbelts got me wondering. We just got our C Class Dodge and one of our top priorities for the winter is getting it set up for seatbelts for the kids. There are none in the back right now. There is a water tank in the forward facing dinette seat, and that is where we want to put the kids. We have room to put a frame around the water tank. My question is, how did you guys setup your vintage Dodge's for seatbelts? Do you have any pics?

Thanks,

Jeff N