There have been several references to the fact that LED lights
draw less current than regular incandescent bulbs. This is very true. This is one of their benefits.
It was stated in one of the posts that the greater current requirement of incandescent bulbs would mitigate the effects of corrosion on a bulb socket. This, I propose is entirely untrue. The best way to prevent bulb socket corrosion, whether you use LED's or regular incandescent bulbs is to apply some dielectric grease to the bulb and socket before replacing whatever kind of bulb you use. Dielectric grease is readily available at any automotive parts store. You should also apply some to the plug/socket which connects your trailer to the tow vehicle. This too is to prevent corrosion by keeping moisture from the essential contacts.
There have also been comments on the flashing speed of turn signals if/when LED bulbs are used. I suggest that you can get a steady and predictable flasher speed by replacing the stock vehicle turn signal relay with a solid state version. Again, these are readily available at any auto parts outlet.
The stock turn signal relay in most vehicles is designed for the electrical
load on the stock vehicle. For example, in many vehicles you may notice that when one (front or rear) of the turn signal bulb filaments burn out, the turn signals on that side will now flash at an abnormally quick rate.
The more robust solid state turn signal relays can '"flash" a much greater load, for example when you hook up your trailer to your tow vehicle.
It is true that LED lights
"turn on" much faster than incandescent bulbs. They respond much more quickly when power is applied to them. They literally "snap" on compared to incandescent bulbs which take a noticeable amount of time for the filament to heat up and glow. This could be considered a plus, or simply a "feature", and hence not so critical.
In general all other things being equal, LED's are brighter and consume less electrical
power. In lighting
, the future is LED. There is no reason why you can't continue using regular incandescent bulbs. However, LED's are less likely to burn out, as they are advertised as having 100,000 hour lifetimes minimum.