No need for wood or fender mod to remove the rear wheel easily.
Simply unbolt the four nuts where the drive shaft mounts to the Final drive.
Remove the wheel and final drive as one unit. So much easier to do and your supposed to check/lube in there anyway.
See pic and part number 92015A (4 nuts)
http://www.ronayers.com/oemparts/a/kaw/500b25caf8700223e478f53c/drive-shaft-final-gearFor the front wheel a scissor jack or hydraulic jack works well under the engine but put a strap on the center stand (holding forward) to prevent it from flipping back up.