I have the full length front runner, expedition one. it is 2.8m long and weighs in at 45kg according to the spec, it is only the half expedition so it is flat at the back for the RTT.
Expedition LR Defender 2.8E - Dolium Pty Ltd
Putting it on was a mission, I winched it to the top of the underside of my my car port and drove in under it then lowered it on, only to find out that my car port was lower at one end and I could not reverse out, ( bad planning) I had to unbolt the roof of my car port at one end and jack it up to get the car out. I have to take the rack off again today actually as the deefer goes in to get some corrosion fixed on the roof next to the alpine windows tomorrow. I will be jacking the car port up again today but will try and keep the new height to make it easier to take on and off.
I think me being 5'7" tall does not help and you would need 2 people over 6' to put it on successfully I think..
Pat

