Some interesting ideas in this post. I think the result may depend on the specific hoses used.
I agree with CB4 that there can be axial thrust loads on end points if the straight flexible hose is not taught - and in my experience hoses are not necessarily taught under all operating conditions.
As a sanity check though, take a hose in your back garden, lay it out in a bend, close the end nozzle so no water is flowing, and holding the nozzle, turn on the tap. What happens? Does the middle of the pipe move? What if your restraints do not allow this movement? Is there a load on your hand and the nozzle end? If you are using a trigger nozzle, press the trigger. Does the hose jump? Remember that this is small diameter, very flexible, and relatively low pressure. A couple of thoughts:
1) the difference in surface area of the wall of the pipe on the inside of the bend versus the outside causes the middle of the pipe to kick out which will load supports, especially intermediate ones (the static load can easily be calculated, but this may not be the whole story)
2) Once liquid is flowing, there will be lateral forces on the pipe due to change in momentum considerations (this can be estimated statically, too).
3) plus dynamic loads.
I suspect that the devil is in the detail of your specific installation. I think you are right in giving this careful consideration. Hope these comments help.