All of the hitches we offer for your 2007 Lexus RX 400h are 2-inch Class III types that share the same 350-lb tongue weight (TW) rating. You can see all by clicking on the link provided for you. The Curt # 13530 is the lowest price option and so I recommend this hitch for your 400h since in this instance there's no reason to spend more for the same capacity.
A total weight load of 300-lbs from your dirt bike and its carrier is within the hitch capacity but its also a good idea to check... view full answer...
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