Dale,
About 5 years ago, I bought my first pickup truck.
It was a Dodge Dakota and I've been very happy with it. I've always thought that a hard Tonneau looked great and provided security. All of the folks I know that have trucks,ususally put a cap on them. It looks a little bulky and the rear vision is practically gone. I was told that if you have to haul something big, you'll regret taking the cover off and on.
After 5 years, I've hauled dirt, mulch, engines, jukeboxes, large screen TV's, refrigerators, stoves, you name it. I've never removed the cover but I have unbolted the gas struts and raised the cover to use my engine hoist to load and unload motors.
I say go with the hard Tonneau. The look great, lock very well and are as secure as any car trunk, give you great rear visibility, and better gas mileage that an open pickup.
RapRap
1940 ChoppedChevyCoupe