I always thought why not affix a rope to a giant tire, and then put a large thing of wood or metal on top of it, and then load weight plates on that platform...
But the tire might fall apart? I dunno. Seems gentler on grass than the prowler.
Sorry for the no reply I was away at a mates beach house. Regarding the size of it, the two tall handles and t bars can both come out so it folds down flat. Still takes up a fair amount of size horizontally but vertically it is relatively small.
My prowler isnt the Elite one because I live in Australia and with shipping it would cost something like $1000 US. I got mine made for me by a guy I found off ebay. Cost me $330 AUD including postage.
You would actually be suprised how gentle the prowler is on grass. The bottom of it is smooth metal that is designed to slide so it doesnt rip up grass to much.