Undersized axles will not cause sway, they will just bend and put the wheels out of alignment. Doubtful if the axles are too light. Look underneath for the tag on the axle and see what size it is. Wildcat is a lower priced weekend type unit and it will be a far cry from your Hitchiker in build quality. Your best price should be 30-35% below the list price.
B.O.
Former Ram/Cummins owner
2015 Silverado 3500 D/A DRW
Yup I'm a fanboy!
2016 Cedar Creek 36CKTS