One disadvantage of the 10K+ trailers is you could potentially get pulled over quicker if you pass up weigh stations (search for several threads in many different car forums about people being pulled over, and in a number of cases, having major problems for not having CDLs). There is a DOT required reflective strip around the bottom of the heavier trailers. I'm not sure of the exact laws regarding this, but it's along the lines of any trailer over 10K rating must have it. In a way, it can be a calling card to the police if/when they're looking to pull over people who pass up the weigh stations.

In addition to being careful about what you load, I would strongly suggest upgrading the tires and wheels if you think you might be at all close to the rated weight. Many people have had tire issues - belts and general blowout. The tires supplied on most all 7000# trailers are just barely adequate. Both the Pace Shadow and Pursuit trailers will easily handle the better load rated tires/wheels (225 instead of the standard 205 size), suspect all other major brand trailers will as well.

If having a trailer custom made, most major brands will build to the 7000# spec, but you can pay for an upgrade to the 5000/5200# axles (doesn't change the trailer rating). Some will custom build to a spec just under 10K (9999?) - this is of course a much more expensive option.