Super fast hazzard lights

Turn signal flasher operates a 2 X 1157 bulb load. Yes there are indicator bulbs in all inst' panels and some models have fender mounted signals. Those small bulbs don't add enough load to notice a difference in flash rate. Add a trailer with 2 more 1157 bulbs and signals will operate much faster while trailer is connected. Given enough time and use that OEM signal flasher would die. So the same condition as signal flasher placed in the hazard circuit.
Heavy duty flashers are built to same load, operate the same, just live longer.
A hazard flasher is designed for twice the standard turn signal load. It physically looks different. That flasher in signal circuit without a trailer might not flash at all or very slow in some models.