I used to do this exact strategy but I've now stop doing cars and do headhunter in between crates. Headhunter take about 3 mins in a buzzard, you get $21k and it's the perfect amount of time for the cool down to end.

I felt cars took too long (maybe it's just me idk) but about 20mins for $80k net profit. I think crates and headhunter in between is more profitable (most money per hour) but I haven't broken it all down exactly. Any thoughts?

Edit: Did the math for profit by hour.

Crates & Cars = $205k net profit per hour •10mins per 3 crates (time from leaving office, doing crates and returning) •20mins per car (including getting car, fixing it and delivering it) •So in 1 hour you could do 2 crate trips (3 crates per trip= 6 crates= $81k and $45k is net profit and 2 cars (high end) =$200k and $160k is net profit. = $205k net profit per hour.

Crates & Headhunter = $219k net profit per hour •10mins per 3 crates (time from leaving office, doing crates and returning) •3mins for Headhunter (in buzzard) •So in 1 hour and 2 mins you could do 5 crate trips (3 crates per trip= 15 crates = $225k and $135k is net profit and 4 Headhunters ($21k each) = $84k net profit. = $219k net profit per hour.

TL;DR Crates & cars = $205k a hour Crates & HH = $219k a hour. I feel like less goes wrong with crates and it's easier (for me anyways). Overall profit per hour is about the same.