You may think that by having as many trucks as possible, whether new and used, that your profits would increase, but this is generally not the case. If you have a large fleet of 100 trucks where most of them are used and in poor condition, I guarantee that you will make more with 15 brand new trucks.
After learning this lesson the hard and expensive way, my company switched to all brand new trucks and learned some lessons in that arena as well. Neither option is perfect, but you can use the best features of both options and experience positive results. Both worlds of leasing trucks and financing (buying) them have advantages and disadvantages.
What worked best for me may not work best for everyone, but my solution was the most cost effective in my experience. We learned these important lessons on our path to becoming a profitable company:
Leasing
Definitely a great choice. You will have a relatively standard monthly payment, the ability to easily estimate your cash flow, and the capacity to plan for investment expansion and the management of overall company finances.