Will that make the fan work harder since it's not drawing in open air. Kinda gives me the idea like sucking thru a straw that has obstruction. One of my TBirds, I put a push & pull low profile fans in. The pull fan is thermo switch started and the push is toggled on off in cab if I sit in congested traffic and see a heat rise. Personally IMO I think pull fans work better when a condenser sits in front of a radiator and always use a shroud.

LOL, by the time you finish your truck Geezer, we will be living on Mars and flying hovercrafts.