By the bulkier-than-Hasselblad remark, I assume the OP isn't talking about the Rolleiflex twin lens reflex cameras.
The Rolleiflex SL66 is an old favorite of mine, and an excellent outfit for macro photography even with the standard 80mm lens. Built-in bellows with tilt allow both close focus and additional depth of field control up to ~ 1:2 magnification, while bayonets on front of 80mm lens allow lens to be reverse-mounted for 1:1 magnification. The last of that line was the SL66SE, and I recall seeing them in the stores well beyond 1995. Very expensive!
The Rollei 6008/6006/SLX et al were very different beasts and more directly comparable to Hasselblad. Motorized Hasselblads with electronic leaf shutters, that is. Also very expensive new though not particularly macro-oriented. I really wanted a 6008 at the time but never got to try one.
Rollei lenses & backs: Probably want to do some research there, as backwards compatibility didn't seem to be a top priority for the company.
The best way to acquire a Rolleiflex SLR outfit at a good price is to buy a complete multi-lens system lens shades, finders and what-not all included, as some of the small items were surprisingly (even astoundingly) expensive when new, even ones which look like ordinary plastic parts.