You might want to sit down and think this one out. What do you think that you should do to get started?
1. Have you ever washed a car before? Think of a truck as a big car.
2. Who is your competition? What system do they use? Trust me, in the LA area, I know of about 10 competitors that are all big enough to crush you, and a bunch of others that are good guys, but are not terribly fond of losing accounts. What are you going to do to differentiate yourself from them?
3. How much do you want to spend to get started? If you are talking full wash and recovery operations, it could be $40k down to $15k and that is just to start. I have a trailer that I have about $50k worth of equipment on to wash trucks and other things.
4. What are your local regulations? You are in LA, you do have regulations.
5. What are you going to do for insurance. The big companies will not even consider you without million dollar liability. We had a company in Phoenix that learned the lesson the hard way. He was washing what used to be a good sized fleet of trucks and his machine ran out of fuel. Using his trusty dusty plastic gas can, he was refilling his machine, when EVERYTHING blew up and caught fire. It scared him so bad, he threw the gas can...right on a brand new KW. The truck caught fire, as well as 5 trucks in either direction. Total loss, $1.5 million dollars. Put the pressure washer out of business, put the trucking company that was on the edge of struggling under, and was generally a mess.
For what it is worth, it was not me. I got the job of trying to clean up the mess and preparing trucks for auction.
So research those things and let me know what you are thinking. I have some more things that you need to find out for yourself, if you really want to be as good as you can be.