I have a sampson bimini built for my samson tower. It attaches to the tower, adjustable height, easy up, easy down, easy install. I use the doubles on my tower to act as my surf rack and added another rack for additional boards on top. I have plenty of room in my boat to store my skates.
If you want a cargo bimini then Monster will be the way to go for the money. If you want a easy up and easy down bimini and utilize your tower like I have I would go Samson.
Also, I don't it is recommended to tow high speeds for long distances with the cargo rack. Shane, you tow more now, how's that work out?