Get ahold of a (or make/have made) a small "Bruce" pattern anchor that will never foul the bottom and hold more fast than others. Its designed to back itself out of a jam. They are used on oil rigs on down to yaks. Texas Kayak Fishing (I think it is named) web pages have pics and maybe a source to purchase. Had one made for me from old lawn mower blades that I should have never parted with. Trolleys should be on your weak hand side and be configured to INSTANTLY jettison. A small float will allow to recover your anchor and line after an emergency release. Brush hook from Blakemore is the only one you want. All the above is mostly pertinent to fishing still water, anchoring in moving water is an invitation to swim.