Tough to "find" a rack capable of the job for the long haul
Note that a rack good for a car/truck might be not be good for Motorhome. Very few are rated for TT or 5th and that's essentially what your toad would be. Small side to side forces are different when towed than when driven and sure would suck to loose a Rad on the highway due to metal fatigue!
Rad Power bikes are HEAVY as are most $ conscious good eBikes! Common bike rack choices capable of eBike weights are few. Consider your bike weight and find a rack design capability that exceeds your dynamic weight requirements.