MF - you have to know before you ask them that they will not stop tipping the truck out until no more comes out - they will give you 1 load or 10 loads, but not 1/2 load.
You can tell them to stop - they won't take any notice - only chance they will stop tipping is to offer them a 6 pack of cold beer each haha.
Norm, make sure you put a bit of fertiliser under the mulch - fresh mulch pulls nitrogen out, then puts in back in 6 months later as it decays. Just something to note if you are using it on picky/prized plants.
Nice looking house by the way