Ask if they need a bucket truck installed in the tree, or branches professionally removed from a tree without damage or injury.
Sorry, just installed our last bucket truck and are waiting on a new shipment.
A lot of people are just uninformed and think only unroped drunks climb trees, starting on ladders.
Give them the benefit of the doubt that they don't know and are feeling out a company in a sea of mediocre companies.
A customer asked me about fixing the fence.
I said I don't really know about fixing chain-link fences, just a lot about not breaking them.
He said a previous bidder was singing the praises of his new power pole saw, and was going to cut everything from the ground, probably off an a-frame ladder, so inevitable damage to the fence (the cheapest his neighbor could buy, and not robust) would result.
After talking to someone like that, you might think all successful people buy bucket trucks for $150,000, never knowing you can buy death-trap trucks, or buy one that doesn't run so that you can honestly say you have a bucket truck, and show a picture with signs (at the company owner's house where it stays).