I don’t know weights or dimensions of the campers or your truck but just taking a WAG say a camper has a weight of 4500 lbs and places its COG 8” behind the rear axle. The said camper will cause a moment of force of 4500 x 8 inch lbs in a clockwise direction about your rear axle. If your truck has a wheel base of 176” the weight being lifted off your trucks front axle would be 4500 x 8/176 or 205 lbs. That would be approximately equivalent to the weight taken off your front axle when a trailer with a tongue weight of 750 lbs is placed on a ball hitch located 48” behind your rear axle.