Got a set of Insa turbo Special Tracks 4 for £450 squid (18mm tread) (all 4) on 1 ton rims one needs new valve also includes a Khumo Venture MT as A spare good tread at least 10mm) so 5 wheels in all . Sizes 285 75 16 so would require wheel spacers to keep the turning circle . If you get stuck...