Your car is not going to notice the extra 200/300 Kilos hanging off the back.
The use 4th instead of 5th is generally reserved for heavy loads. Ie not a bike in a 6*4.
A heavy caravan or loaded car trailer, well then probably yes (mind you Ive never worried too much about it, 5th on straights, 4th for hills and overtaking).
It is also somewhat dependent on your tyre size.


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