My wife and I were at Land Between the Lakes last October. As mentioned above, the Hillman Ferry campground will accept large rigs.
It is also the only campground in the Rec. area with full hook-ups! The lake was drawn down to winter pool, so I missed out on shore fishing, but should be up to normal by now.
It is a beautiful place to visit and the fishing is great. Make sure to check out the Elk and Bison prairie. Go early or at evening for best chance of seeing the critters!
We plan to head back this Spring for another visit. Feel free to ask questions if there is anything else I can help you with!