problem is, NHRA teams can't hang till monday like NASCAR does then go to the next event and load in on Thursday.
NASCAR teams can do it because most teams have a parts hauler, old engines and parts get offloaded at the destination track and new parts are loaded on. I've seen it first hand, just like cars are handed off, usually at same time.
Many NHRA teams have 1 backup car and 0 spare parts on the trailer, except for DSR, JFR, ect that have 9 18-wheelers for 4 cars. The pro-stock teams don't even carry spare cars usually. Like V-gaines said, they have to drive from charlotte to Denver, unload the dart, strip it and put parts on the avenger, load the avenger in the trailer, then come out here to dallas. Most of the teams are done if they lose a car in qualifying.