I know there are a few trailer users on here, so a bit of advice needed. Last year, I got a second hand trailer. It was a good price. It was a 2004 trailer, but supposed to be 'like new'. I had to travel about 60 miles to view it, but prepared to walk away if it wasn't a good one. On viewing, I couldn't believe it was 16 years old, but turns out it had hardly been used and stored inside for a long time. It still has the surface moulding pips on the tyre tread. It was a beauty. I asked the guy how heavy it was, he thought about 300-400Kg, which is typical for an 8X6 4 wheel trailer. I made sure the brakes were working OK, and nothing seized and set off. I headed back to the motorway on back roads. Everything fine, but the car (Honda CRV 2 litre) seemed to be a bit sluggish. I was concerned the brakes may be binding a bit, so I stopped before the motorway to check. Absolutely no heat in the drums or tyres. The trailed had stopped on a bit of a slope, so two of the wheels were off the ground and they turned really freely. Wheels stopped when I put on the brake, released immediately. The tow hitch was working freely. Everything looked fine. I set off on the motorway, It seemed to be OK. I was taking it easy, about 50ish. Driving along in 6th gear, the first hill I got to, my goodness, the car was struggling, down to 5th, had lost momentum, so down to 4th and speed picks up. I was thinking rubbish towing car!! long story short. When I got home and read up about trailer weights I could see the rating on the plate. Trailer load +1075kg = 2000Kg max. The empty trailer was 1075Kg!!! Clyde built and some!. Built like a tank! That's why my car was finding it tougher than I expected. The trailer has the wheels under the body, which makes it a dream to tow and three sides fold down, so a dream to load, but it has 10-145 inch tyres 82 load rating, so 1900Kg total load. I would like to replace the tyres, even though they have new tread. They are too old and possibly been flat for years, they degrade with time. I can get 84/82 tyres, but that would not increase the total load. I would still be limited to 1900Kg. It's irrelevant for my car, I have a limit of 1700Kg, but my son in law has a large truck and can tow 2700Kg. I have a suspicion the wheels may have been changed from 12 to 10 inch. otherwise they couldn't plate the trailer at 2000Kg?? assuming they were original. I can get also get 145-10 84N which would bring the trailer back to a max 2000Kg load. I just want to do a sanity check and make sure with a single rated tyre '84' there is no fiddle factor to apply when 4 of them are used on a trailer??