Carry Trading Influences

I have been looking at carry trading. Since I am a newbie, I have
no idea if the average trend trader or even swing trader trades in
the direction of the carry as well as the trend.

So it appears if a trend trader uses moving averages crossovers combined with
a carry, then the trader has an edge. It is like trading into the wind instead of against it. I wonder if carry negates the effect of slippage and spread on
specific kind of transaction…

Yea, indeed, the carry could negate any transaction costs if you held the position long enough (1-2 days should be sufficient).