Just thought I'd post about an alternative slide out drawer option from CamperX here:
http://camperx.ch/produkt/t5-heckauszug/ If your German isn't good, use Chrome, right click on the page and click 'Translate'.
I've got one of these, and I can really recommend them. It works a treat, the mechanism is very smooth, it can take 100kg, it locks in place (fully in and out), it bolts easily into the slide rails, and it comes with anti-slip matting. I think something like this is a bit of a must-have for a 3 seat beach. It really makes it possible to use all the space very efficiently under the multiflex board, without having to pull everything out onto the floor to get to what you need. They even do a narrower version for the Ocean. It is very quick to put in and take out of the van.
Jonas is the guy at CamperX that I dealt with and he was super helpful with ordering and instructions. The unit isn't cheap when you add in postage and VAT on import (it comes from Switzerland), but it's excellent quality and as others have mentioned on this thread the parts are not cheap, so if you are handy enough to make one then great. If not, I'd recommend you save your pennies for one.
We have tried using the drawer for different things - the fridge, beach stuff, driveaway awning. It works fine for all of them.
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