@yearning4yeshua I operate an arborist company with my partner. In our area, it is very uncommon for tree services to rent out bucket trucks. Most companies purchase their own, or just don't take that kind of work. Do some good research and look at what rental companies are offering and at what prices- why would someone rent from you instead?
As for starting an arborist company without any experience.... no. Please don't, our trees need qualified, trained professionals working on them. We have the highest insurance rating for a reason, it's dangerous, people DIE every year.
If I were to buy a truck, I would do a mini crane truck. Something for small loads, for projects by homeowners, small projects etc. I think this is where there is a gap in services in my area.