Re: Rattling/Sqeaking noise in 05 Escape
First, remove all the cargo. Everything, if it didn't come attached to the vehicle, take it out. Make sure the spare tire is mounted tightly. I've encountered a problem where a spare would loose air pressure and start to bang around as the sidewalls would collapse a bit. If that doesn't solve the problem get a friend to ride in the back seat and try to pinpoint the noise, or have a friend drive and you try to pinpoint the noise.
Depending on your mileage you may just have a rattler. My 9 year old Durango has recently developed a shallow rattling sound (loose dash!) but isn't pronounced on the highway.
A maintenance item that is highly recommended, especially if you get snow in the winter months, is to spray all the weatherstripping around the doors and tailgate with a silicone spray lube. Every three months will prevent some squeaking down the road and prolong the life of the rubber to prevent leaks...as a lot of people don't realize that rubber does degrade over time and in extreme temperatures.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!