You could have 1 person working full time in a van doing the bulk if you have decent work if you yourself worked 2-3 days a week imo you’d be better off than your 3 vans financially and far less stressed as it’s easier to organise,it’s all about how quickly and easily you can get to you’re number per day without knocking your pipe out every day-week. Makes no difference how many vans or staff you have within reason in this job I mean,every area of the country is different what might be a good days work in one place might just be a couple of jobs in another.
If coming off the tools is so important to you get the right person it can be done with 1 employee,ok you edge your bets if they were to leave but you are in a similar position if you have 3 vans and you lose 2 employees makes no difference.