When I was looking for a bike rack to hold two 70 lb e-bikes on the rear of a motorhome the only ones that fit the bill were ones from Hollywood, Swagman, and 1UP. At the time the ones from Hollywood and Swagman were out of stock everywhere. I bought the 1Up Super Duty Double rack and it has been excellent. I used it with the two 70 lb e-bikes and now with two 27 lb e-bikes.
The 1Up rack as a terrible ramp and so I bought a motorcycle/dirt bike ramp on Amazon and modified one end with cable clamps so it could be easily attached to the 1up rack. It worked very well. With heavy e-bike a longer ramp makes it much easier to wheel a bike up onto the platform. I bought a folding ramp so it would be easier to fit in the RV compartment.
https://www.amazon.com/gp/product/B00HJUKB12/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
For security with the bike on the RV I bought a $15 motion alarm from Amazon and a cover to fit over both bikes and a heavy duty cargo net to fit over the bike cover. A thief would have to put in a lot of time and effort with little way to know if there were bikes of real value under the cargo net and bike cover.
https://www.amazon.com/gp/product/B08BLDZN2G/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1