might be possible, I've only ever tried to fit 2 at a time lol,
only way I can think that it would work, 1 rear tyre in back first, 1 front tyre on angle with hatch in the back sitting on the other tyre.
move front seat forward as much as possible and see if you can fit maybe the front behind the seat, or more the front seat back as much as possible and try put the front sideways on the floor in front of the seat/back tyre sitting on the front seat itself.
again highly going to depend on sizes, I run 20x 305's and 255's, and I doubt 4 would fit in lol, haven't tried though! give it a go
