Generator Adapter 30A L14-30P Male to RV Shore Power L5-30R Female with Locking Ring you can use this adapter

you can use this adapter

Made with heavy duty 10 gauge cable

this high-power adapter is perfect for those of you Tesla owners who also have another electric vehicle in the garage – use this adapter to charge both cars from your Tesla wall charger

Weather-resistant and suitable for outdoor use

but is limited to 12 amps

Generator Adapter 30A L14-30P Male to RV Shore Power L5-30R Female with Locking Ring you can use this adapterThis handy little adapter converts from a NEMA L5 30 (30 Amp locking) receptacle to a L14 30 generator connector, making it easy to connect your RV to a generator transfer switch. The locking ring shown is removable. This product comes with a 3 year warranty.