Will Alum work ? Yes
Are there good Alum rockers ? Yes
Are all Alum rockers equal ? Nope
For street use I stay away from Alum I have seen them live no problem , but where I lived Summer averaged approx 5 days so very few engines saw a lot of regular miles .
T&D make serious alum rockers but I bet they use a far better alum alloy & cost 3x as much typically Starting around $1000 for a set .
For street I use Iron or Stainless , just my preference . They seem to be the most cost effective for reliable long life