An honest answer on this thread will be hard to find.
None of your business sorry would be mine.

No offence meant.
To know how to charge I would offer the following, I'm sure there are better ways, but here's my tuppence worth.
Do the maths, what are your REAL running costs, add that to what you want to earn then add about 15-20% for aggro and down days and your about there.
When I say real running costs I mean replacing a van, tax, sick days, holidays, replacing equipment, accountancy,etc etc etc, you will be very surprised how high those costs can be, work a daily rate for them, divide that how many hours you actually work and hey-presto.