Having used the typical trailer harness, that's another cheap connector option that I wouldn't trust long term for heavy use. When I was towing my boat and ATV trailers regularly, I had to replace the connectors twice in a few years, the typical trailer connector doesn't seem suited for heavy use.
Truthfully, any connector you buy for a peanuts is likely to be a sub-standard connector, the nature of the beast.
I'm not going to try to convince you any further, I'll keep using what I use and you keep using what you use. 
