Just an add on to my above tip...The 6 foot Aluminum ladder is the one that is used in the RV to climb into the upper bunk. Work great in my 85 Westy.
so long for now...
gowesty.com sells a upper bunk ladder
Our first parts order after buying our Westy last month included the GoWesty folding stool that we stow folded behind the driver's seat, and it has proven very handy. When camped it stands outside the door to assist entry/exit and we bring it in at night where it lives on the floor in the nook behind the driver's seat in front of the sink.
Come bedtime, the drill is to face the front of the van, step on the stool with the right foot, then step with the left on the front table brace and boost up to the upper bunk. Reverse to get down. I may put some skateboard grip tape on the table brace for improved grip.
We use the ice chest as a first step than to the sink table and up to the bunk. Seems most places we camp have a critter problem it isn't a bad idea to bring the ice chest in at night.
I don't ever sleep up there, but when I need to get up there I step on the passenger side seat pedestal then onto the sink/stove cabinet. I've usually got a milk crate with me too that I can use if needed.
As we have gotten older the challenge of accessing the upper bunk in our '82 diesel Westy reached the point where at times it was no longer fun. As luck would have it, about the same time GoWesty had a sale on their ladder. It's a good product - powder coated tubing that (when not in use) is hinged to fold up to fit either in the hole at the rear of the upper mattress (behind the folded over front portion) or directly over head, with the ends resting on the sides of the camper cutout in the roof. It's strong enough to support us easily, stores in otherwise unused space, and works great for us.