My small C is very TC-Like. Sore or weak knees have caused me trouble getting up the down the entrance steps. Getting two total knee replacements did not change this. Losing about 50 pounds would probably help, but there are still some high steps to deal with.
For the cabover bed, access has never been an issue. However, I find that my new knees don't want me to do the crawling around necessary for tucking in the far corners of the bedding.
Modifications: install extra assist handles and use them Add stepstools as DJ does.