Need info on Amer Camp vs Jayco Travel Trailer

Looking to purchase my first travel trailer. I have found an Ameri Camp and a Jayco that I am interested in. The Ameri Camp is a 2004 32ft long and the Jayco isa 2005 30ft Eagle. The Ameri Camp is 6500 lbs vs the Jayco which is 8500. Could that be because the Ameri Camp is made with particle board and would it be the alumunium structure and not wood? Does anyone have any information on the structure of an Ameri Camp vs the Jayco Eagle?