A.S. has it right - ABSOLUTELY.
Having spent all our children's inheritance on the AS, we couldn't afford the $2000 they were asking for a slide, but my ancient back couldn't take crawling in and out of the bed either.
For less than $120.00 I built a 7-1/2 foot slide that's made our trips a pleasure. It eats up 2-1/4 vertical inches and took a weekend to build, including the trips to Home Depot.
Now if I've done this right, there s/b 4 pictures attached: opened, closed, bed detail and anti-tip design.