I've been on a couple of trips with www.wildbike.co.uk and going on their All Mountain Trip up Snowdon this year found them very professional and have some excellent trips on their website including Utah and Arizona (Maybe one day?)
Went on their All Mountain trip in the Lake District last year...
Any recommendations on tyre inserts/foam to reduce pinch flats been looking at Wiggle | Vittoria Air-Liner Tubeless Insert | Tyre Spares
Not cheap though?