There are numerous ways to achieve what you desire when adapting gas supply points or appliances to our intended uses.
Bottom line to me is simple. Talk with a reliable, experienced propane supplier. If possible take your coach/trailer and your appliances along so everyone knows what they are dealing with. Their advice is very inexpensive (free) and their parts are reasonable. Do things right once and don't worry.
Just remember, over the years the loss of qualified technicians employed by propane suppliers has seen a lot of turnover. If you don't feel comfortable with someone's advice find another source. A lot of todays young techs don't know half of what the old guys have forgotten. They'll learn, it just doesn't have to be you they learn on.