new guy with an old trailer

the trailer is approximately 27 ft (paced off) but I cant find a weight for it anywhere........ My fathers F150 towed it without even flinching and without the weight distributing hitch, But my boss who has been rv'ing for 25 years said I should be fine with the explorer and a WDH, he said when this trailer was new most people towed them with a station wagon or four door sedan. I am a little skeptical but it would be nice if I could take it with my family without having to borrow Dad's truck.

Kevin