Review on CZC AUTO 12V Two Sided Magnetic Towing Light Kit - Powerful 55lb Magnetic Strength for Trailer RV Boat Truck by Paul Dobson

Probably the best magnetic headlights I've found for under $200. The magnets are very strong, at least 50#, and will easily stay connected to a galvanized steel trailer at 70 mph. They are not waterproof, but they can withstand rain without any problems. My only complaint is that the wires are not well insulated so you have to cover them with plastic wrap or you risk damaging the wires. I covered mine, and now I don't even think about it. Aside from that one star deduction, they're great for my little fishing trailer and I'd easily recommend them considering most magnetic tow lights fall the first time they hit a bump or the wind resistance hits 40mph.