With an almost 1000lb dry tw, you will probably want at least 1400-1500lb bars. The "brochure" dry tw usually doesn't include the weight of the propane tanks or a battery. Those will put you close to 1200lbs before loading anything else in the trailer.
Good luck in you search for a 2500 'Burb or Excursion. If you find one of the GM Twins, check the factory hitch very closely. There have been some failures of that style factory hitch.
As mentioned, look into the Reese Dual Cam, Reese SC, Equal-I-Zer 4 way system, or possibly the Blue Ox system. Depending on your loaded tw, the Hensley or ProPride systems are rated even better. But the max tw is 1400lbs for both of these systems.
Good luck!