Thats 800 KG for the short ones and 1250 for long /large ones. As you say, thats a load that maybe the floor cannot take, you have to remember that alko chassies are not only used for caravan, but trailers of other sorts.
It is interesting to know that ALKO state the steadys are rated from 800 kg load to 1250 kgs static load capacity.
And while you are having to level the van you might have to get it up on a ramp so the Alko wheel lock receptacle is aligned exactly to take the lock. Easy if side to side is level .... but virtually impossible if you have to run one wheel up inclined chocks. The art of compromise.
Know what you mean about the mover, Ive had to use a piece of board in front of the ramp to just give the lift to clear the mover.Edited: Base lengths of 32",27" & 20" All a good bit longer than needed, but cut from a what appears was a standard 2 metre board. The varying lengths affords a modest climb for the mover if all three are needed, though that is rare as I dislike such pitches.
Might be wise to shorten them all by 6" to save bulk in boot.
I think you have it the same as myself , and then maybe another twist. 😂I think the general rule of thumb is that if it feels right, your floor doesnt creak, and all the doors shut properly, it probably is right.