On Aug 23, 9:30 pm, Eric Greenwell wrote:
I'm curious about where this 7% number comes from. The number I
routinely see is 10%, and it's always stated as a *minimum*, not an optimum.

The Caravan Club of Great Britain. They contracted Bath University to
do some thorough research in the 1990s using a heavily instrumented
caravan and towcar. TBH, in all the advice above, I was just quoting
them :-).


Dan