Many vehicles like your 2003 Toyota Avalon are specified to use only a powered (or active) trailer lighting harness such as the four shown on the link provided, one of which is the Curt # C59236. The Hopkins harness # HM11141820 that you referenced also requires a 12V power connection to the vehicle battery, but note this harness is not a fit for your 2003 Avalon.
The reason that only powered harnesses are offered for your car is that the wiring in the vehicle is not heavy enough to handle... view full answer...
The 2007 Avalon is rated only for a light-duty Class I hitch, so there is no Class II hitch available.
Light duty Class I hitches have specific weight limitations; for example a hitch-mount bike rack for a Class I hitch can carry only 2 bikes maximum, regardless of the capacity of the bike rack itself. I have linked an article on hitch classes that will explain in detail.
We have the Curt Hitch # C11427 that is a confirmed fit for your Avalon. This is a bolt on hitch that requires no... view full answer...
You are correct that only 1-1/4-inch Class II hitches are offered for your 2015 Toyota Avalon. The reason no larger hitches are made for the Avalon is that its frame does not have the strength to support a higher-capacity hitch. In fact, it is possible that your owner's manual will indicate that the car itself has a TW rating lower than the two available hitches, and in this case the lower rating becomes the overall limit.
The highest-rated option is Curt hitch # C12107 which has a 350-lb... view full answer...
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