The Reich Comfort and Reich Economy Light have traditionally been the weapon of choice for most Eriba owners.
Both these models are now discontinued, but you may find suppliers still carry old stock.
Reich now produce the Easydriver range which comprises both manual and auto-engagement units.
I'm fitting an Easydriver Pro 1.8 (Pro is the auto engagement version, 1.8 is the max caravan weight in Kg) to a 2018 Triton 420 this week, and if I manage to do a half-decent job I'll post some pics of the installation.