Repairs for an Onan RV generator can be booked online or on the phone. Or they can offer you many other suggestions, like the huge jet-boat run through the rapids in Niagara Gorge, musket demonstrations at 300. Your hosts can arrange a van tour, door-to-door, to the jaw-dropping view. The most famous waterfall in America thunders just minutes away from your peaceful campsite at Niagara Falls North/Lewiston KOA. DIRECTOR FIXED OPS LEWISTON RV Lewiston, ID. Bring your passion to wherever you want to be. Pricing for the Travel Trailer begins at $60 per night, and the Popup Trailer starts. On average, in Lewiston, MN, the 5th Wheel trailer starts at $70 per night. Towable RVs include 5th Wheel, Travel Trailers, Popups, and Toy Hauler. On average expect to pay $185 per night for Class A, $149 per night for Class B and $179 per night for Class C.