DEK IT is a graph mount.. the troll n tray hold tools like pliers etc.
Copied this off of the Troll-N-Tray website:
"The Troll-N-Tray™ Caddie is designed to bring everything you need to successfully land fish right to your fingertips. Keep your knife, pliers, and cold beverages safely stored and within reach. The Caddie is made out of 1/8" aluminum, giving it the ability to stand up to you and Mother Nature. Also, with the addition of our optional mounting bracket, you can easily mount any sonar directly to the Caddie
(as seen in the last image). All mounting hardware is included."
You can mount your graph on the Troll-N-Tray, just wondering if it is as sturdy as the Dek-It