Sloooooow turn signals

trapster said

from what I understand the heavy duty flashers flash independently of the current draw of the load themselves. Whereas the standard flashers blink faster under a heavy load and slower under a light load.

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Yep, hazard flasher blinks all 4 corners so it is a different flasher from standard turn flasher. Heavy duty. If you should add something like a boat trailer with turn signals you will need the heavy duty/hazard type flasher. OEM turn signal flasher will not survive on a long trip. Example... I added a trailer hitch and light harness to our 1st 67 B'cuda to pull my brothers boat to a Crappie-thon event about 350 miles away. Turn signals flashed very fast on the trip down. Twitched the heck outa my amp gauge at a stop/off ramp (lower alternator output at lower RPM). That flasher died about half way home.
On the other hand... If you replaced OEM type bulbs with LEDs, they dont draw nearly enough current to cycle the OEM flasher. You would need a modern solid state type flasher module. Todays flasher modules operate off time via silicon chips instead of current flow and heat generated by heat.