Look into Crestliner boats. They offer a 14' deep-V, open hull boat (with flat flooring inside that is coated with Rhino-coat) that is the WIDEST 14' boat on the market. Very stable and a great fishing machine. I've been in one for many years and can tell you they are tops. I too suffer from back problems and with the roller bunk trailer, she launches and pulls off quite easily. Compact, yet providing ample fishing space for two people. You could do a lot worse, that's for sure! Mine is a tiller model, which I find works beautifully with a 25 HP 4-Stroke Yamaha tiller engine (rated for 35). Here's a link:
Sport Utility Boat - Crestliner Sportsman - Working Boat