RV's with aluminum shells are notorious for creating wifi problems. The metal shell blocks wifi signals from outside your RV reaching your devices inside your RV. I great solution for this is a repeater with a directional antenna. The antenna is mounted to the exterior of your RV pointed in the direction of the wife antennas. You will have a repeater/router installed inside your RV which rebraodcasts this network inside your RV. The new network created inside your RV will provide strong signal to all your devices and will also provide ethernet ports for your devices that are not wireless.
Here is our recomended product from Simple Wifi to solve this problem. This product comes pre-configured so you should be able to plug it in and start using it:
