Hey Stuart, thanks for your question. I will start by saying that using a hitch adapter such as the # HT5R does indeed reduce the tongue weight capacity of the hitch by half. So in the case of the Draw-Tite hitch # 24931 for the 2018 Infiniti Q50, you would be limited to 100 lbs of tongue weight capacity. This is including the weight of the adapter itself (8 lbs) plus the weight of your carrier plus whatever cargo. We cannot recommend exceeding this weight capacity, even though you are... view full answer...
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