I’ve just driven 150 miles or so. When i stopped at my first drop I noticed that the tyres on the back/3rd axle of the trailer were warm/hot to touch. The tyres on axle 1 and 2 were cold.
Anyone got any ideas why this might be?
All tyres looked fully inflated.
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just the tyres ? how about the wheels and hubs ? both sides ? binding brakes, bearings failing, bodywork rubbing. might look inflated , proof is in the pressure ( check that when cold )
Hubs felt ok. Mud guards were ok.
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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
[emoji106]
Booked it off for mechanic to look at. Nothing hot enough to melt so maybe caught it early.
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Assuming it’s on air sus pension, is it at correct running height?
If low there will be more weight on rear axle rather than spread over all 3 axles.
Trailer wasn’t sitting down on it’s stops, ie airbags not inflated?
If this carries on being the case, next time you use a weighbridge loaded ask the operator if you can check two weights before you leave, that of all trailer axles and the rearmost on its own.
Back in the days of steel springs when stretching tandem axle trailers and slinging another axle in front of the two (conversions by messrs Bodgit & Scarper) for upping carrying capacity when GVW went up from 32 to 38 ton, one tipper trailer i used one day i had reason to use an axle weigher at one place, instead of around 7 tons each axle the rear most weighed in at 12 tons with corresponding lower weights on the other two, it was immediately taken off the road and sent for fluidride conversion.
Also, never feel a wheel to see if its hot, as they can get effin hot indeed if you have a binding brake! It’s enough to first hold your hand close to the hub (about an inch away, in old money 
) first to feel the heat. Otherwise you might end up as an entry in the accident book!
Ride height looked ok. It wasn’t sitting down on the stops but I did noticed that it was closer to the stops on the rear axle compared to the first two. It’s on air so could be air bags gone, yet there was no air leak sounds, bags looked intact and no high air consumption warnings.
Booked it off, we never see the machanics so probably never know full answer.
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