I have a few friends who've purchased older kei trucks. One for use on his property, the other got his tagged in NC (IIRC, it was NC). The local bicycle shop also has a kei van as their "shop truck" (another used one imported from Japan). The imports will go faster than 25mph, but they are terrible on the highway. The 25mph is an artificial limit to meet LSV regulations.

All that said, $25k isn't cheap when you can get a basic Polaris SXS for $15k. It might not be street legal in many states, but much of the usage is going to be on private property.

I'm in Western North Carolina(Asheville) and there are an actual number of kei trucks here. Not every other vehicle common but enough to see maybe 5-10 every day.

There are even a few businesses that specialize in these vehicles: https://www.marsminitrucks.com

I think a kei truck might be a better choice than a sxs if noise ordinances are a concern. e.g. utility vehicles for groundskeeping staff