My answer I'm giving you today is alot different than my answer to you would have been 10 years ago. The answers that fit for you will depend on your personal situation.
10 years ago I owned a CD franchise, 3 vans, had an office, secretary and sales were climbing every year, dramatically. Then around 2006 I detected a slowdown in sales and we didn't grow after that, actually shrinking a bit. I blame the economy, but who knows maybe it was me and my management decisions?
I
HATED having employees. Biggest PIA ever. I tried to hire smart. I interviewed everyone I hired twice, checked references. Most turned out to be duds. I hired acquaintances, (not close friends) and those who had been recommended to me. Most still turned out to be duds. I never hired my son to work and I'm glad I didn't. I don't think that would have been good in our case for the father/son relationship. I know others here have done so and it works so YMMV.
While I hated having employees I also understand that there is no way around it if you what to grow and develop into a multi-van operation. In my opinion you either have to remain small and do the work yourself OR get big. It's that middle ground that kills ya. The second van is not a big money maker, it's actually almost a money pit when you consider your extra costs such as workmans comp and insurance and taxes. DO NOT FORGET about paying your taxes,
ESPECIALLY your payroll taxes. You'll learn a hard lesson if you don't. Don't ask me how I know, but I am still paying a monthly payment to you IRS.
The 3rd van you will start making you decent money again. BUT you do have the added employee hassles.
In early 2008 I closed my business. I tried to sell it, but I was a year too late. Could have sold for a good amount if I had sold then but ended up with nothing. Sucks. Big time. 14 years and nothing to really show for it. At that time I had no intention of ever being in the carpet cleaning business again, much less cleaning carpet physically myself. If someone would have told me then that in 5 years I'd be doing what I'm doing today I'd have laughed in their face.
But after trying a few other things that sputtered along I decided to start cleaning carpets again part time to supplement things. I'm VERY fortunate to have a wife that has a great, well paying job with benefits, so that takes ALOT of pressure off me. Today after 4 years of being a one man band I'm happy, generally stress free and actually putting more money in my wallet than I was when I had 3 vans going. If I'm on vacation or taking a day off I don't have the worry anymore of what is going on at the office, or what is some employee screwing up (and something ALWAYS happened when I took time off) BUT at the same time if I'm not working I'm not making money either. Pick your poison.
So 10 years ago I would have told you to keep getting bigger. Today (again for me anyway at my age and my place in life) small is better. You got to look at what your needs are. Is making $120K enough for you? What is making enough for you? If you have a job average of $200 ( many guys here talk of higher averages so this estimate might be too low) and can schedule 13-15 jobs a week you'll average around $3k per week, $12K per month, around $150K for the year. Easier said than done, and you'll be tired but it can be done.
After all that info I'm not even sure I answered your question.
