Not a request - but a solution. Not not affiliated etc etc...
These:
are *very* good and surprisingly inexpensive for what they are.. Just used some to put some better support under a 4x2 shed base frame where the gap at one corner was up to 70mm.
The megapads support upto 800kg and the mini-megapads 400kg.
One of those rare finds where it's like "why doesn't everyone use these"? (OK, everyone with sloping shed bases!)