They're surprisingly capable little vehicles offroad.

They may have about 660cc engines and about 40 HP (Acty is 38 and Sambar is 45) but they only weigh about 1800 lbs, have 4wd, rear mounted engines, locking diffs (in the Acty Attack), and crawler gears (in the Sambar and the Acty Attack). Oh and a really short wheel base (less than 6ft).

And the parts are plentiful (though need ordered from abroad typically).

70mph is a pipe dream for them but 55mph is something they can typically do all day. So the right lane on highways is your home, but I'd be avoiding highways whenever possible anyways due to the prevalence of brodozers.

As a fun little aside, one of my friends is planning to buy one and put a liter bike motor in it for the lols. I can't wait to see the results but that will be sometime in July at the earliest due to shipping times of the kei truck.