You can always fit the Polyairs and remove the valves when in the hills.
I did this on my old car and never pinched a bag.

I also fitted a cross tube and ball valve so that the air could go from side to side offroad like in the new Disco 3 and RR. I could not get it to be leak free but recently I found that I just hadn't sealed the nipples on the ball valve properly ( while idly playing with old bits I had lying around). This was about 15 years ago so I was ahead of my time.LOL
I ended up being an expert on removing and refitting the Polyairs, but they do not inhibit articulation as much as anti roll bars do.

Regards Philip A