I had kept quiet in this thread because I like bigger units than were being discussed. I have a 13 H.P. DeWalt and it's much more than would ever be needed unless one is cleaning and repainting frames or suspensions. That said I can cut it back and do anything I need on a car or turn it up and wash the gutters in front of my home.
What you mentioned here is in an entirely different league than some of the smaller electric units being mentioned. Big difference, big improvement in potential cleaning ability but you must realize that knowing how to use this is a must in order to keep paint on panels. 3000 p.s.i. can blow paint off. The smaller units are pretty much safe running full tilt. With 3000 p.s.i. you have to be careful. It isn't hard and I'm not trying to talk you out of it. I think that it's exactly what you should do. They aren't quite as portable but I don't travel.
Here's something to bring a smile to your face. I had a friend a number of years back that hit his then 3 day old Trans Am with a larger 6 H.P. gas powered unit. The next week he was getting his fender and part of the hood repainted. It literally blew a 2 ft. strip of paint off of the car. It's funny now it was tragic when it happened.
Good luck on your purchase.