I have 2019 Outback with factory installed hitch mount. Could buy the Subaru model of Thule bike rack but saw that this one is very lightweight and could possibly hold 3 bikes safely? Rack weighs only 20 lbs. we would have up to 3 adult mountain bikes (Specialized, Trek) bikes on it. Anyone with more knowledge about load weight tell me if this is a good idea or not? Thanks!