I wouldn't waste your money on a radar detector. They bring more scrutiny to your rig and if a cop is really trying to enforce speed he will get you with his radar/lidar before your detector even has a chance to beep. I can expand on this if anyone is interested but will hold off for now.
/source: was a cop for 5 years, quit last january to make real $.
2013 JK Sport (see info on left)
FOR SALE: ($3,500) 1983 CJ7, 258-I6, 32/36 Weber Carb, 32x11.5x15 tires, SOA
Utah Jeep Crew #178