The springs should be bowed downward, from the hangers on each end down to the axle, so if it is sitting on the rubber bumper on the chassis, you need to have them replaced or either add a set of air bags to the springs.
Sagging like they are now, the front of the coach is probably over loaded or the springs are just worn out & cant support the load anymore.
Adding air bags may be cheaper than having the springs replaced & adding an extra spring, you'll need to get the proper one or two to provide the proper amount of support.
Neil