Colin, my local gas company who dilivers
propane to my house makes up hoses.
Rubber hoses will vibrate and if it's touching anything, over time it will ware a hole in it.
My opinion is to use the stainless gas line with the Yellow jacket with flared connections. I personally use the high shouldered nuts on these flared fittings, for better staybility
If not comfortable doing this job, get a profesional.
Always test gas lines after working on them and over the course of the season I will test them...just takes a few minutes.