Yes, we're getting one of these to trial before perhaps putting them together in a package:

The Backpack is fine to carry for the occasional window, but if you want to move around a property with it a sack truck makes it easier.
Paul
c
i have that exact trolley , i started wfp with a back pack, ( shurflo) nearly 6 years ago, still got both , and still use them both on a few jobs, where it is easier than using van mount , had to cut a hole in base , to access on off switch on pack , excellent trolley.
daz