CONGRATULATIONS on your new purchase.
All the Columbus 5ers we have looked at in the past two years had outside LP hookups. Your salesperson should be able to tell you.
Our Columbus 340RK has a dedicated external quick connect just behind the passenger side rear wheels. We even saw a 340RK with opposing external quick connects.
We changed out the LP fitting/regulator on the gas grill by adding a quick connect fitting with a 12' LP hose...on more green LP bottles.