Kohree RV Slide Out Supports Jack with a Flat Top Support Block, Supports up to 5000lbs, Adjustable from 20"-49", Heavy Duty Camper Slide-Out Leveling Jacks, Set of 2

There are telescoping bed end supports that look like a pipe with two flat ends on them. They extend up from the ground to the bottom of the bed for your peace of mind something like this https://www.amazon.com/dp/B0CPBC5N1X