Pay the fine and move on. Even if dismissed, will probably have to pay court costs which are usually in the $50-75 range.
Despite the clause in the regs, if it has a motor they are going to nail you if you aren't running lights. If you have a hard floor, I screwed a pvc pipe cap onto the floor. Attached an 18" piece of pvc tube to the light to make it removable during the day. If the floor is soft, use the suction cups, but glue them on so they don't pop off. If the suction cups don't have removable posts, may need to mod them abit so the light is removable for storage, etc.
The fire extinguisher varies by state, don't need one in VA. +1 on the whistle.