I have the same one, it is/was made by Big Country.
I cut mine down to just 1m long, I cut a piece ot of the middle and had it welded back together again. It now fits on the front part of the roof, and the RTT still fits on the back. My RTT opens backwards over the door, giving protection to the door area when open.
Those feet are home made, not very nice. African Outback make and sell really nice robust stainless steel feet. I however mounted their feet to two 25 x 25 x 3mm wall thickness bars, thereby lifting the RTT enough to fit a set of rails to fit a aluminium camping table under the tent as well.