cougar axles

Hi everyone, I am in need of a bit of help and information. I have a 2007 cougar. Now I haven't put new tires on the trailer since new, and that is something that will be done. Now my brother was here the other day, and said to me your tires are wearing and your both your axles are bent. (They curve up in the middle a bit) Now he's never owned a trailer before so I am not sure. My neighbour said that they are suppose have a little bit of a bow. I will post some pictures later. If you can help me out that would be great!

Thanks.