ECONORAM, I've found out that if you can overlap the front layer on top of the trailing layer...the air pressure will keep the top layer trapped on top of the trailing layer when yer driving down the road...kinda like how roof shingles work with water. You can see how I layered my skirting.
I have found that Tyvek tape does really well on Coroplast compared to clear packing tape or duct/Gorilla tape. Great fer fixing cuts or extra holes.
I ended up putting the wire guides back in as it was working and I didn't have to come up with any new fab work before setting out on the road.
Got to my destination yesterday (Tampa) and noticed that my PVC tubing support across the rear wheel had been rubbing and it cut some of my zip tie supports off. I think in part the severe wind buffeting may have overloaded the support's stiffness. Luckily the Coroplast panels didn't fall off. To fix this I need to come up with a metal support instead of the current PVC support. I might have to look at some metal tubing or angle. If it doesn't git fixed, I'll have to pull the rear wheel skirts and run with an open wheel or partial wheel skirt setup on the trip back home.
After recording my fuel data, I did notice that my fuel mileage seems to be more consistant across the board. Also, the truck did track nicely when there wasn't anyone around me but was rather squirrely when someone was passing or beside me. There were some strong crosswinds during this part of the drive that might have influenced the tracking as well.