Just make sure the trailers are presenting enough tongue weight so they remain stable at speed on the highway. Insufficient tongue weight, like what happens when new towers load their trailers so they are balanced with little to no tongue weight, will cause the trailer to start swaying on the highway, often viciously.
What's enough tongue weight? No less than 10% of the trailer's total loaded weight needs to be resting on the hitch ball (tongue weight). If a trailer weighs 1800 lbs. total with its cargo, no less than 180 lbs. needs to be resting on the hitch ball. 15% max.