DesF replied:

Hi I have a Jayco Eagle 93 model and it had 13" cross-ply on it, I have replaced them with 14" wheels and 8 ply Olympic tyres 185/75x14 ( $85.00) , they fit in Ok and are wearing well, for most trips I run 40lb as the recommended 45lb seems to shake everything about. we went to WA etc and it rode well and tyre wear was minimal.
I got the rims from the tyre shop only $28.00 each .
Cheers Des.

Member - Duncs replied:

If it is in any way possible match your wheels and tyres on the camper to the wheels and tyres on the towing vehicle.

Being able to interchange car to trailer and trailer to has got me out of a lot of trouble on many occasions.

I run the car at about 40psi on the highway and the trailer at about 30psi on the highway. It has taken me a while to settle on the trailer pressure and it is not what the trailer manufacturer recommended butit seems to work.

When reducing tyre pressures say in sand I drop the trailer to match the car. So if the car is 20psi so is the trailer.

Duncs