i would have assumed hardwood but exterior ply hardwood which has a different 'glue' than internal hardwood ply, however if there is no chance of water ingress then internal ply could be used, but i would go for the best you can afford if you want to do the best job that you can?
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets