however, i will add that CMUs are rated at 2000 psi compression force. minimum, standard, internationally regulated. the weight of these cars is in the 3600lbs or so curb weight If memory serves for the AWD variety. So as long as one is not
1. using an already compromised block
2. Point loading said block as the only single support
3. using it in an orientation that it's not intended to support a load, say, on it's side (this is likely where many people go wrong, instead of laying something flat like a 2x6 or 2x4 across the openings and opting to place the block on it's side, in which orientation it is not rated for 2000 psi compressive force)
a person should have no problem supporting the full weight of this vehicle on 4 CMU blocks at 4 points. I would, however, still recommend pavers if they're available (they can be had for cheap enough) since their starting compressive rate is more in the neighborhood of 30 MegaPascals, which is around 4300-4400 psi, which should be capable of taking a point load even under a near fully loaded (up to manufacturer specifications) vehicle. though for reasons of keeping the vehicle balanced one should always unload the vehicle as close to curb weight as possible, or make sure their load is either centered or evenly distributed throughout the vehicle, as well as on a level surface. Sometimes, however, the latter is impossible, but the vehicle can be leveled as lifted somewhat safely by having some sturdy shims of a complementing angle to the grade to shim the supports flat and one begins the lift from the lowest of the four corners. It's best to do this with a shimmed bottle jack to lift level so your jack doesn't tip, instead of a quick jack, since they're on wheels and tend to roll as you lift. Best to lift only as high as needed to initially level the vehicle then go around again to add necessary height. always pull the parking brake and chock at least the rear wheels, but any that are on the ground is good practice. i've done this many times on areas that were sloped in two directions so that all four wheels were initially at different heights, leveling the vehicle, then lifting it high enough to roll under on a creeper and do any necessary work without concern.
