You say you can't close the road, have you thought about using a cherry picker, that way you can divert the traffic around your vechicle, a lot safer, and more health and safety.
Price wise
Cherry picker £200 per day plus vat including driver = £940.00
2 Guys @ £35 each per hour times by 7 hour day times by 4 days = £2900.00
Total Price = £2760 plus vat if registed
Even though you are charging £35 per hour per man, you do not pay this to them.