I have a garage with a smooth concrete floor and find that I cannot use
ramps without placing a stick between the ramp and the wall so that the
ramps do not slide forward when I try and drive up them.  The ramps just
slide across the floor.  I have the standard red metal ramps. I don't bother
using ramps with my 2WD vanagon because its becomes to much work.

I do not have that problem with the syncro though.  In fact you can place
the ramps in front or behind the wheels and drive up them in either
direction.  Also, you can place the ramps on one side (as in drivers or
passenger side, not only front or back) and elevate one side.  This is
useful for removing the driveshaft etc.  And the ramps stay in place, they
don't slide across the floor.  I guess all four wheels are pulling or
pushing.  This suggests that there is always a little bit of torque going to
the front axle at all times.
While I'm on the topic, the approach to my garage is steep and I drive in at
an angle.  One wheel of the van falls lower than the others, and there is
less weight on it.  The syncro feels much different than the 2WD vanagon
when I drive into the garage.  I'm not spinning the tires or anything when
I'm going in, its just that you can feel that 1 - 3% (or whatever it is)
amount of torque most all the time.

Gary Lee
Calgary, Alberta