Once you add up two Radrover ebikes, shipping, and any extra accessories, you will be under the $2000 per if you picked the Radrover. Rad Power Bikes also makes a folding Radmini with 4" fat tires if you need a smaller storage footprint or you need something with a lower stand over height. The Radcity has pretty much the same specs as the Rover; but, has 2.3" tires, fenders, two different frame sizes, rear rack along with front suspension. I like the 4" fat tires because they can travel between paved roads, sandy beaches, and every where else in-between very smoothly. I work commute at 20-23 mph for 13 miles roundtrip on paved roads and sometimes take a detour to ride the hard packed to sandy single track trails before or after work without missing a beat.
You can find the same mix of bikes with Volt, Teo, and some others around the same price range. I would get something within the 2"-4" tire range, 48v, 11 to 17 A/h battery, twist or hand throttle with Pedal assist, front suspension forks, cargo capacity (or mounts for racks/baskets), 500-750 watts, and 180mm brakes.
Pretty much all ebikes in this range are around +60 lbs if that is a consideration. That weight is too heavy for my wife to lift on our platform bike rack even with the 7 lbs battery removed.
I don't have a RV; but, I do travel with my Radrovers on my SUV (Grand Canyon, Sedona, eastern NM). I had no problems travelling with the Radrover once I prepped for the road (removed battery, seat post with seat, rack bag, wrapped LCD in saran wrap, etc...). I even have a weather proof travel cover that encases both bikes and the rack if we run into really bad weather or if I want to cover the bikes overnight on the back of the SUV.