I also did it this year onboard my Nukeproof Mega. I was lucky enough to have no crashes on the qualifier or main race.
Amongst the my group of 8 riders we were mostly running bikes with 160mm forks & 140 - 160mm at the rear (my Mega, a Spicy, Two Orange 5's, a Spesh Enduro, Transition Bottlerocket), but one of my group did ride a Zesty & the other a DH rig (Morewood).
Most people doing the race ride a 160mm bike, which I think is the best choice. There is some climbing to do on the course (not much admittedly), but enough to regret riding a DH bike. I even saw one guy on a singlespeed hardtail.
Oh & a dropper post is well worth having. I'd also agree on running dual ply tyres & DH tubes.
Worth bearing in mind is how the qualifier works - it determines which main race you go off in - if you finish: -
1-35 = Megavalanche (main race)
36-70 = Mega Challengers
71-104 = Mega Amateurs
Time is irrelevant - it's all about your placing. Anything higher than 105 & you get put into the Mega Affinity 1 or 2 - the main difference being put into either of these is that it's no longer mass start - two of our group ended up in these races & were a bit disappointed that they didn't get the mass start.