if your connectors are in good condition, dielectric grease is the ticket, the pressure from the female contacts will displace the grease and make a firm connection on the male on the tow vehicle. if the trailer side is well used, the connectors get spread out, and make a poor connection.
With my Envoy, I found that the factory side of the wiring harness that plugs into the connector had corroded to the point it had to be replaced, I filled it with dielectric when I re-assembled it, and no problems so far.
If dust is a problem, you probably need to replace the cap for the plug.
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