As a retired 40 yrs over the road truck driver,you see aluminum wheels on big rigs solely to reduce weight of truck to allow more payload.
I was at an RV show here in Atlanta and very disappointed in Forest River for putting those stupid inserts in steel wheels, makes rig look cheap in my opinion... most Alcoa's aluminum are high polish an require only soap an water to look good for years, yes you can take them to a very high polish shine with a buffer, but not necessary in my opinion to look nice ...... in my forty years i have never had any problem with aluminum rims. I've run them front and back.
We've got a Georgetown 378 with aluminum. I always wondered how many owners know they got aluminum out side an steel inside, a little trick big riggers use to make there rig look nice when weight for them is not an issue ...... would like to hear how you like your Berkshire ....