Rubber Isolators or no?

Ok, time for another round of "Charles's Idiot Questions", with your host...
Charles Summers!

Thank you contestants, you know the rules... the first person with the most
convincing argument wins!

First question, for $100... I went to the local BPS to pick up some of those
little rubber trolling motor bolts and a connector cable for the batteries.
After getting home and opening the box the new trolling motor was in, I
found a little bag of 6 long bolts, washers, and nuts, and after reading the
directions... they are for mounting the motor to the boat. But, the rubber
ones are for mounting too! So, which method should I go with? The rubber
isolators or the bolts with nuts?

Now... before you jump in here, there is a part two.

The rubber bolts keep the trolling motor from resting on the gelcoat
preventing damage. If I went with the bolts that were in the box, should I
use something with them to prevent the mount from damaging the gelcoat, or
is mounting the motor without a cushion ok?

insert calming music here