Based on the information you provided I can almost guarantee you have 3,500 lbs axles, which means you'd want 3,500 lbs brakes like part # AKEBRK-35-SA (my personal recommendation) and grease seal # 58846. You can't hardly beat these brakes both value and ease of use. They are self-adjusting which means you won't have to worry about manually adjusting your brakes each year.
I can also tell you that Coachmen used 3,500 lbs axles on many of their trailers. About 15% of your trailers GVWR... view full answer...