What siize are my Sunraysiers?

You dont have to take a tyre off. By the inside he means the side away from the road. The numbers are usually something like
6JJ ???? Dot ?????

6JJ being the rim type the other numbers being width and offset
They are stamped into the inner face of the rim and are usually hard to see. A torch on an angle in a darker room quite often shows them up better
Here is a calculator which will give you all the measurements that you want

http://www.rims-n-tires.com/rt_specs.jsp

cheers Graham H, sorry i forgot to tell him that,thanx mate.

The make and model of the ute would probably be a big help as well and make it easier to give an answer as the rims would possibly be the same offset as original or if not would be a bit wider

This is crfitical. I just went through the same issue.

First check the offset of your vehicle then ask the trailer manufacturer if this is acceptable. The place I bought the trailer from said they would only certify it if i brought them a wheel with tyres on and they would say yea or nay for that combination.

Thanks for the offer Vince
would jump on the opportunity but i live down in southern NSW on the border of Vic, i think a courier would end up costing more that what they are worth to buy down here.

Cheers pickles