No ; just a 5 gallon bucket , car wash soap , a car wash brush with extension handle and a garden hose
Power washers have a tendency to force water into areas that should remain dry .
I use a power washer for the initial bulk cleaning when I've just returned from driving on muddy back roads. I do the underside as well on both the truck and trailer. It doesn't do a perfect job but it sure gets rid of the majority of stuff.
Yes, a little bit of common sense is required about where you point it.