Hard to go wrong with the bigtex. make sure you treat the underside of the decking as well as the top. i use used motor oil. i was going to add do you think you'll ever upgrade the ATV's to a UTV. and to think of one wide enough for that. as usual i'm late to the game though.
i tried the wireless cameras they use the 900 mhz and there is barely enough bandwidth in that for video and it sucks, i've seen some 5 ghz ones but never used them. When i towed doubles i ran 6 wire low voltage cable (think security systems) and a separate 5 pole round plug at the truck and trailer for hooking to the truck. this was by far the best video quality i found.
i tried the wireless cameras they use the 900 mhz and there is barely enough bandwidth in that for video and it sucks, i've seen some 5 ghz ones but never used them. When i towed doubles i ran 6 wire low voltage cable (think security systems) and a separate 5 pole round plug at the truck and trailer for hooking to the truck. this was by far the best video quality i found.