They might have water hookups that are in the ground, covered usually with a plastic lid rather than spigots on the building. I don’t think a lift is viable except where there is pavement. It will really tear up that grass and if the ground is soft, well, fuggetaboudit…No way in hell would I ever attempt trad poling them.
I purchased a Gardiner wfp backpack (not actually to wear, just carry or cart around) and I love it. If you have a method of transporting water to the site or to make it from inside the building it’s what I use for all my wfp work. Might not be good for this situation, but for me it works wonders in areas they don’t have spigots. Have a 125 gal tank in my through I just fill halfway full when it gets low and refill the Gardiner as needed. If you can get wfp to work it will be worth it.
On hydrophobic glass I sometimes wfp, rinse, and then have a squeegee on the back of the wfp that I squeegee off just to make sure it’s done well. But I’m not nearly as much as an expert on wfp as most of these guys.