FWIW: Through the local Ineos Agent/dealer, I purchased 2 sets of the "Ineos" RhinoRack roof bars. About half the price of the roof rack and half the weight (4 x 7kg = 28kg all up). The bars are the RhinoRack "Pioneer" bars- "industrial" in size and strength with slots on all four surfaces allowing multiple fixtures to be installed. By changing the number of bars on the roof to suit the "mission" and the distance between them, all sorts of different arrangements are possible.. e.g. different size baskets (or no basket) etc.
I set them in place on the garage floor approximating their relative position on the roof (supported up the middle by a couple of 2.7m lengths of 75 -35mm timber to stop them toppling). I was then able to put various item in place to gain the most efficient layout including weight distribution rather than trying to work it out "in situ" as is were.... Maxtrax, tent poles, light weight Oasis Trekka roof top tent, 3 x 20L squat Scepter fuel cans and a long handled shovel... and a 2.5m length of slotted (32mm) angle (Dexion) to which is clipped my 5kg DIY self supporting awning : 138k total.
Far more versatile than a standard roof rack.