It sounds like the best choice is probably low-loss foam RG-8 type cable with a stranded inner conductor -- for example, Belden 9913F7. Standard RG-8 (with solid PE dielectric) will hold up better than foam-dielectric cable, but the UHF loss becomes excessive on long runs. RG-8X, with its smaller diameter, is lightweight and quite easy to handle, but its loss is even worse than standard RG-8. Although, on a short run, like 25 feet, 8X might be acceptable
I would stay away from regular 9913 or LMR-400, because these have solid inner conductors. As you probably know, these are quickly damaged if frequently coiled and uncoiled.
Superflex 1/2" Heliax has less loss than foam "RG-8", and the fine corrugations in the outer conductor allow a tighter bend radius than standard Heliax, but superflex still has a solid inner conductor which will eventually fatigue and break. I once tried using it a remote truck (around a Will-Burt mast, protected in a piece of Nycoil) but it failed within a couple of years, due to the continual flexing.
