As said, could be brakes binding or the brakes are out of adjustment so I’d say get whoever does maintenance to check the slack adjusters on your trailer or could be the bearings or hubs. Again, get maintenance to check those too as could be dry and need oil or lubricants.
How hot is hot too, I pulled into the services once and the hub was so hot, it melted the wheel flags on the lug nuts 
Turned out I had a busted brake chamber
Edit just re read the OP post, if hubs are not hot but tires are then Perhaps it would be the tire pressures, more weight on on axle or just imperfections on the tires themselves