Just got a new Jayco and it does not come with a ladder to the over/cab bunk. Called the factory and was told it does not come with one and suggested I "jump" up to get into it. At age 83 I don't do...
Couple years ago someone asked a similar question. I drew up this idea. If you're handy with a saw and hammer, this shouldn't be too difficult to make. Of course you'll have to improvise for your specific camper.