Interest is of no concern to me, it’s depreciation. When you start adding that $10kish a year of depreciation in, with interest and operation costs, it will make you sick.

Just some general numbers. But a truck for $50k, drive it for ten years, sell it for $5k. $2000yr in maintainence and repairs. $45k in depreciation, $5k interest, insurance cost of $1200/yr, etc. that adds up to $82k to drive that truck for 10 years.

Comparing that to shopping for a good deal on a couple of used trucks during that time frame, you knock out interest, some of your ins. Cost, a lot of your depreciation, and probably have a slightly higher maintenance and repair bill. Cost of operation is about a $40k swing over that same time frame. That’s a lot of money you could have been earning your 8% interest on.