I currently have a 53 foot road trailer supported by concrete block piers while I remove the subframe that carries the dual axles and the landing gear. It's a perfectly safe method of supporting heavy weights - - -IF- - - - -and this is a big one- - - -the blocks are stacked the same way they would be used to build a building. Never- - - -ever- - - -put any weight on the web section of a concrete block! I put four blocks side by side into a square arrangement, then stack another layer on top with the arrangement of blocks turned 90 degrees, etc., until I get the height I desire, then use 2X12 lumber to spread out the load over the entire top surface. A pair of square piers like this on each side of the frame with a 6X6 timber between them will support several tons of weight safely. Just be sure you don't build the support piers on soft or muddy ground. A stack of cross-hatched railroad ties is another very safe way to support heavy loads- - - - -I've worked on bulldozers with the tracks removed very safely by supporting the equipment with timbers.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!