The water lines in almost all newer campers are 1/2 inch PEX, with crimp style connections. You will need a crimp tool and some crimp rings, along with valves. Now if yours are capped, and you want to just spin some valves on, it would be 1/2 inch pipe thread.
Not sure, FPT (female pipe thread), or MPT, male pipe thread). Have seen both on new campers, but regardless, still 1/2 inch.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT