Though we do not have a trailer hitch available for your 2018 Lexus RX 450hL we do offer The SeaSucker Hornet Rear Window Bike Rack for 1 Bike - Handlebar Mount - Vacuum Cup Mounted # 298-BH1302.
This bike rack can hold up to 1 bike that weighs up to 35 pounds. The suction cup mount has a pull strength of 120 pounds.
If you're wanting to carry cargo you can get a roof rack system then attach a cargo carrier on the rack.
If you have flush mounted rails:
The Rhino Rack Vortex Crossbars... view full answer...
The Yakima OnRamp Bike Rack for 2 Electric Bikes # Y36FR does have a hitch pin lock # Y07235 that you can purchase separately to deter theft of the rack from your trailer hitch. view full answer...