I think the key here is the application.
Since you say Ramcharger I have to ask-
Are you going to take it off road? Ever?
If you are- Go with the Steel- toooooo easy to crush a aluminum line with a rock, tree stump, large branch, etc.
You don't wanna know how I know that....

If you are never going off road then the Aluminum is just fine. Been using it on street and track cars for decades...no problems at all.

Hope this helps,
CC.