As a general rule of thumb never go to more than 3 brokers when looking for a quote, the reason being is any more than three shows up across the whole system and any favourable rates floating around in the market place will lock you out.
I believe my combined Liability for 10 million and our fleet vehicle insurance was just over 5K for the year, I do have a working at height limit of 35 metres, anything outside of that I have to pay an addition charge, but being a small outfit with only three trucks on the road I generally do not do much over 10 lifts circa 20 metres.