Re: R3 vs R4 vs BaseFit
The R-4 just like any standard 4X4 rack is good to go without getting bolted down as long as you are not doing band work.
So basically if you plan on attaching bands to the base and pulling on them then this is not optimal. You want the rack to be set in stone when doing West Side type band work.
Let me know if you have any other questions.