Some watermen prefer longer handles, but they have a tendency to break off easily. Choose a dip net that is most comfortable for you. A wide brass roller is mounted horizontally at the end between two vertical guides. The trotline is pulled up with a gaff and laid on top the brass roller between the guides. It's not hard to rig something like this up.
Some people use a household rolling pin as a roller.
Others fashion a large hook out of metal or PVC pipe to serve this purpose. Or, if they don't, you may not have enough time to net them. In either case you can employ the use of a tow-board to slow your boat. A tow-board is a wide board mounted on the stern, which can be raised or lowered into the water. When lowered, it slows the boat in a strong following sea.