Your problem has less to do with luck than it has to do with your lead foot. Luck gets you out of the ticket AFTER the cop pulls you over, your own driving gets you pulled over.
Lots of people I know got pulled over MORE after getting a radar detector. Probably because they felt like they could speed without getting caught, and they did and....well, they got caught.
I wouldn't recommend radar jammers for long trips unless you know they're legal in all the states you'll cross. Same for detectors, although I think states usually post signs at the border stating the legality of detectors.
Laser detectors are almost completely useless. Cops like laser for 2 reasons. 1) speed accuracy. 2) individual vehicle accuracy. If a cop points a laser at the car in front of you and gets a reflection off his plate, you won't know the cop is using laser yet. You'll probably know if he's using radar, though.
For big speed traps get a map and a CB. Sometimes drivers will mention speedtraps on the CB and, if you're familiar with the area or watch mile markers (if the mile is mentioned) then you'll know about the trap in advance.
Or just don't speed. Or just pay the friggin ticket for breaking the law.
b