I've had a go at separating them to a state by state listing...
And putting them in alphabetical order and dropping out the blokes who were in other occupations in the motor trade other than to do with car sales. Most of the list is, however, based on previous posts and there may be some I've missed or not dealt with properly.
I have also added a lot of names I've come across, though I have had to put a query against some and there's a little list at the bottom of 'uncertainties' and an unknown location. I have listed Brian Maguire under Victoria because I think he may have come from there.
Any changes needed, please advise and I will edit this post.
WA
Sydney Anderson
Eric Armstrong
Jack Ayres
Aub Victor Badger
Alf Barbagallo
Rod Donovan
Clem Dwyer
Jim Harwood
Don Hall
Wally Higgs
John Hughes
Ron Lindau
John Luscombe
Cyril Poole
Ron Posselt
Brian Rhodes
Gordon Stephenson
George Wakelin
Ray, here are some more West Australians;
Dave Sullivan
David 'Rockford'
Jim Percival
Stuart Campbell
Norm Scott
Max McCracken
Wally Knox
Warren Matthews
Tony McAlinden
Jim Brewer
Don Reimann was involved in interstate car procurement and sales in conjunction with Jack Brabham when Don lived in SA [ before he moved to WA.]
I don't know if it was a 'business' as such.
The following drivers were better-known in speedway but did have the odd start at Caversham;
Laurie Stevens
Geoff Stanton
Bill Jost