Brand new RV Should I sanitize fresh water lines / tank

Since it is a new rig, I would do it at least now, then after that if you really do not plan to drink from it, then no. It really is not difficult and or time consuming so why not do it at least now and you may in the process rid your tank of any debris, solvents or odors. We just picked up our new rig last Saturday and like you do not plan to drink from it as we have a Berkley water filter set-up we use for drinking, still I sanitized our freshwater tank today.