We have a 27HFS, just bought a RZR 800S, We thought it wouldn't fit with the rear bed, so we took that out. Once it was in, it appears that it would still fit under the bed, probably touch the roof of the RZR. We still haven't tried it with the bed, since we never use it anyway.
The RZR just fits length wise. Ours has a front cats eye polaris bumper, no rear bumper, has about 1 inch in front and 1 inch in the rear clearance with the door closed. It may still fit with a rear bumper, if it doesn't extend past the rear tires.
Anyway, I can't remember if the 29HFS has a larger garage than the 27... ours is 9ft.