Hi Mike, We have a permanent bed in our Trillium
and we have looked at ways to lift it up easily. Currently we have an axle
cap bolted to the underside of the bed and when we need to lift it we slide a stick into the cap and put the other end on the floor and hope we do not hit it. Works fairly well.
Just found this diagram for using a gas spring. Rear Bed Lift
We looked into this idea or the type of hinges they use on beds with under bed storage, but the cost of the hinges is too much for us. - around $300 US.
If you type Bed Lifts into Google Images and scroll down, you will find all kinds of ideas.