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About time I put some air the tyres of our nr nimrod, looking a bit uneven, looked on air-pressure threads and suggestions vary 34-42. They are quite chunky tyres. Any ideas?

The handbook for my Conway, which is a general booklet, states the following:

It is dangerous to drive with under inflated tyres. The pressure (cold) recommended by tyre manufacturers should be regarded as a minimum

Check the tyre size fitted to your trailer.

Tyre Size                               Min Pressure

400 x 8 X ply                         45 P.S.I.

440 x 10 X ply                       45 P.S.I.

145 x 10 Radial                     32 P.S.I.

155 SR13 Radial                   32/35 P.S.I.

I would read this as a guide, and err on the high side. Hope this helps.