Zacvv wrote:
The trailer has been sitting in a yard for about 2 years
Not sure when it was last packed
With the limited information you have regarding the condition of this rig, you really need to pull the drums IMO and check everything out. You don't know if your brakes are good, shot, or if your bearings are dry and in need of repacking.
It's not a difficult job if you have mechanical experience. Here's a good link that shows the procedure for annual inspection of the brakes, etc on a typical tandem axle trailer:
Annual Brake InspectionIf you do not have the capability to do this type of work, I suggest you pay someone to check everything like the member posted above. Brake and bearing troubles on the road are no fun and ruin many trips.