I've towed similar loads like that with no issues. Many here are very conservative... Experience and attentive towing are most important.
2001 f150 screw 4wd 5.4. Xlt -sold
2004 f150 screw 4wd 5.4. Xlt -sold
2011 f150 screw 4wd ecoboost lariat -sold
2013 f150 screw 4wd ecoboost 157" lariat - current