help looking for info on best sub cover for a wetter climate

[IAFF2407]

First post, I will be more involved here once I get my act together. Own a '72 GMC Sierra, 400HP. have recently purchased a 1972 28' Siver Streak trailer in which we are gutting out and rebuilding with the wow factor. I have just purchased a 1972 2500 super custom 2wd Suburban from "Bob" in taft california - no body rust - completly stock including the original split rims AND nylon tires with at least 60% tread. rear working A/C (has been converted) 350/350 combo. We will be keeping the outside stock, while updating the interior (up to Denali standards, incl. GPS, remot back up camera etc.) I will hanging on to all stock parts, incl. the 350. Good thing my wife is a tire biter.
Questions I have will be many as time progresses. right now, anyone have an idea on the best cover I can use for the sub. I live in the Wet Coast and this will be a daily driver, I just don't like it sitting open in the rain.