You can add to the Rhino hose...I just bought a 15 footer and a 10 footer this year. They are great. Very heavy duty. I would also get the vent covers... well worth it. They are easy to install as long as you have a little time. You will want them for those unexpected rains or it rains while you are gone and you are thinking...did i close the vents? There are other reasons too for getting them. Not sure about the raincaps...my gutters came with small extensions that seem to work fine. Congrats on getting a new rig. RVW seems to do a good job from what I have seen with friends and people here.