The water pressure seems a little weak in our new 3055 rl and have been considering a pump upgrade. Has anyone done this? I think I saw where the landmarks come with a sureflo extreme 5.7 as standard?? I was looking at camping world and they have 2 sureflo extremes - 4.0 and 5.7 and they also have flojet vsd 4.5 all for about the same price. Any thoughts on this upgrade and is it worth the trouble and expense?