(2) 12" fans versus (1) 16" fan

thanks Fire Guy
WE did extensive for Chrysler on the grades of the California desert
The grapevine, the "Baker Grade" The 29 Palms hill
Shrouds work
Spoilers work on the raising the pressure in front lowering behind the radiator problem
and we found that slow pulls with a tailwind the hot air was just going around and around under the core support
IMHO there is not a electric that will work with a big motor and a loaded trailer
I use a 9 blade fan on my truck which is a FSB upgrade from the oem 7 blade high pitch fan
GM has an 11 blade (on my motorhome) which I need to try this summer
I have a two fan pusher off a Merceedez or bmw - had to trim the grille
really helps in stop and go and makes the AC work better
I use a 73 400 jn the speedo line controller to turn the fans off at 28 mph (they controlled the vac advance)
on radiators frontal are is best but do what you have to do
sometimes you can use a big block core support
no flex fans or plastic