In my experience,they are Crazy Heavy. I had a 14' 1947 Aircraft Products "Invader" travel trailer I used to pull with my 1949 Ford F1 pickup. Truck had a (built by me) Turbocharged 300 Six out of an F150 and a 5 speed manual trans,with a 3.55 9" rearend. It was fast. But that old trailer would knock the wind right out of it's sails. Trailer was an all Aluminum "I" beam frame,and an Aluminum skin as well. Everything inside was built quite heavy...cabinets,plywood walls and floor,a pull out couch/bed that must have been made of hardwood and a hundred pounds of springs (I had to remove it once!),etc,etc.It was still so heavy that I could not pick up the tongue by hand. I had to use it's built in jack. IMHO....todays trailers are MUCH lighter.