Even if the sticker information has faded away, the axle ratings might still visible. Take a tour under the trailer, and see if there is a sticker or plate on those. Axles are usually the contributing factor with gross weights, followed by tire ratings.
Lou's information my be spot on. 2 6000 lb. axles, with a 1870 lb. hitch weight would give a 13,870 GVWR. Check the axles for information, weight the trailer, check for empty and gross weights on the title (per Kim), and you should be in the know by then.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263