Any thoughts or recommendations on one person pontoon boats (approximately 8-9 ft.)? I think I am interested in bladderless pontoons such as the River Otter, Black Bear, or Skookum boats. Its primary use will be rivers with 1-3 class riffles/rapids, but would like the versatility to occasionally kick around a lake as well. Features that are important to me include durability, warranty, minimum maintenance tubes, 300+ lb capacity, and enough cargo area to carry overnight gear or a dog. All thoughts or recommendations are appreciated. Thanks much.