You need to narrow down your possible trailers.
5ers need a lot of payload and that's usually the limiting factor, not the tow rating. Therefore, you really want to consider bumping up to the 1 ton SRW...if you think you will go big, dually.
Bumper pulls can typically be handled fine by a 3/4 ton as the hitch weight is about half of the 5er pin weight.
Be careful with 1/2 ton 10,000-11,000 tow rating. Unless you special order, it's almost impossible to get one that will keep all the ratings in line with a trailer that big. Even if it is, you still get bigger brakes and other benefits jumping up to the 3/4-1 ton range.