We recently bought your R40.16 timber sliding door kits up to 40kg, but we’ve changed the doors to heavy pine ones as they’re going to have regular use. Do you have anything suitable?

For doors up to 80kg each in weight, you can use the same track as the R40 that you already have, and buy the Rollan 80 extra door packs, this will give you the wheels etc to run in the tracks, which are strong enough to support your doors.  If the doors are more than 80kg each, then you’d need to go up to the Perlan 140 sliding door gear, which is made by the same manfacturer, Geze, but has a heavier duty track to the Rollan.