Hello does anybody know anything about those bike carriers that just hook up to the hitch? with my budget (about$250)I cannot seem to find a trailer to haul my dr350(about280lbs.) and I'm missing alot of good riding days so those carriers at about $175. seem to be my last option.Are they worth buying them?with my bike and the carrier it will be about 340lbs. just hanging from the reciver is this safe? will it really make the rear of my 98 durango sag alot I don't want to waste my money. Any input will be greatly appreciated