That is a good idea, but I still want it to look like a truck, 'cuz otherwise I would've gotten an onroad car

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I just ordered a wing mount and wing mount adapter from New Era Models that will let me put an 1/8 wing on the back. Should help a lot. Once that gets here, I will see if anything needs to be done to the front of the truck in terms of downforce.
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz