If you go down this road Steve, let me know - if you use the company shown in the link, I can get you a discount. ;)
There are 1 and 2 man units - the 1 man units are a bit more awkward to move around and are larger to cart around, but have more grunt than the 2 man units. You still may need to use water in the holes no matter which one you use.
Cheers - Gav

