Aluminium 5er hitch?

I am curious about this because I have heard a lot of people talk about wear and tear on the landing gear lifting the coupler above the ball...we should be talking about 2-3 inches max... Right? If that's the case then why the concern? Is the landing gear incapable of lifting 2-3 inches reliably?

Those of us with TT's and power tongue jacks often have to let the Jack travel 6-10 inches or more to couple and uncouple.

Thanks!

Jeremiah