Yes- ideally you'd want a short nose gun with a swivel. Makes it 100x easier to wash the car. You can just use an extension rod for the top if you want. Especially when using a foam cannon. Having a foam cannon at the end of a normal long wand is pretty annoying.
This is my gun for example- but...
I run with Mckillans short pressure washer gun + MJJC Foam Cannon +
UBERFLEX Kink Resistant Pressure Washer Hose + Bauer pressure washer from harbor freight with quick disconnects on all of them. Works great- I just use the smaller nozzle on the cannon to get better foam using the electric
Yeah this was my ideal but didn't want to spend that much right now on three. If my current chairs fail and I use them a lot I'll most likely upgrade to Helinox.