379 Antenna Mounting Options

With all the trouble Cascadia drivers are having I would like to get everyone's opinion on Peterbilt mounting. After reading about RF ground there has to be a better setup than what i have. The one point that I keep coming back to from a video is the antenna is after RF ground DIRECTLY under it. Not to the side or behind but has to be under it. That's why I'm leaning towards option A or D. In the pictures white is mount, red is antenna, blue is bracket, and yellow is ground STRAP. Any and all input will help me narrow it down. Thanks.

A--- Co-phased dipole or single if it would work.
B--- Long single toploaded like a Skipshooter ( 6-7 ft)
C--- A plate mounted on top of a copper pipe bracket with a center loaded coil antenna.
D--- A bracket that is bent/welded with a plate to mount stud that is attached to all 4 breather bolts then mount the longest toploaded antenna I can find.

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Thanks Rabbi. That is easy. I always seem to overthink things. Does it matter what material the straps are? Tinned copper and stainless steel look to be very weather resistant. Is wider better and to what limit? After i get everything grounded would you run a single antenna or go dual?