AAAAHH... the real test will be when you have that new trailer loaded for bear ! Load balance is paramount !
As are dedicated TRAILER tires. Too many folks put CAR tires on trailers !
Think of the difference in road/load/and stress differences in what each type tire was designed/built for. Trailer tires do not 'turn', they skid.
Here's a great vid on tires in general;
http://videos.komando.com/2008/08/23/check-your-tires/