I installed a under bed tank on a 66 C10 and mounted a charcoal canister to the rear as far above the tank as was possible.
I picked one up at the wrecking yard but I think they are available new.
It worked fine but still had to leave a couple of inches below the top of the tank for expansion. It should eliminate the fuel smell in the garage.
Fred

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine