I find it sad that you fall in the same category as the people in the Million Mom March. That is, people that think a firearm has the capacity to simply jump off the table and start shooting people of its own accord.As a firefighter, if you wrecked and I was walking up and saw that weapon, legally I would not be able to help you.
And that you are so afraid of these firearms, that you wouldn't perform your sworn duty... sad.
ETA: Oh, and as the title states, I do think it sounds dumb to carry a rifle on a motorcycle. This has no bearing on the OP's right to do so legally.