Without seeing your setup ..I have no idea. My guess is that fender installation will be no more than drilling some holes and bolting the fender flanges right to your trailer.
As far as places to fish with a small boat, I'd do some reading on texaskayakfisherman.com and search for Conroe. I can't remember exactly, but a lot of guys mention two launches off of 1375 that are close to smaller Conroe bays. Stubblefield and Cagle park are the ones mentioned.
Lake Raven at Huntsville State Park is said to hold some ten pounders. It is small water and easily fished with a boat your size. I've never caught much there. Watch out for the gators.
Lake Fayette will allow you to catch some great 3 to 5 lb. bass without venturing out too far, but it can get rough if you get away from the shore much. Launch at Park Praire launch and fish the bay adjacent to the launch.
Yeaga??? Creek at Sommerville is mentioned often for early Spring hybrid and striper runs, but I have never been there.
I, like you, fish saltwater more than fresh. My tinny (1648 Lowe side console) is kept in TN. Here, I am fishing out of my Mini X kayak from October through May. Let's go fishing.
