Yes, the struts are removed when the plunger travel exceeds the limits. The horizontal placement of the underside aluminum bracket on the camper varies on every application. It all depends on which truck you have. Fords, at least 10 yrs ago, had the most frame flex allowing the limit to get there quickly. Short bed trucks in general have less twist to the frame compared to long beds. I can see the limit on my Dodge/Lance through the window and keep an eye open when off-road. It has to be pretty rough to make me remove the struts.The biggest woe I have had with the struts is not understanding that there TWO, 2 allen set screws in the aluminum housing sliding bracket, stacked, one on top of the other that attaches to the underside of the overhang of the camper. Only once (it's like kissing the toaster) did I exceed the limit of travel of the strut on the pass side and pulled the underside bracket off. After that I tightened the screw holes into the wood frame with wooden matchsticks and later with perforated metal lath screw hole mender and bigger screws.
I feel naked without the struts on the highway. If i was not used to them, I'm not sure I would go out and buy a set. My little Lance has the north/south queen bed so the overhang is very long. I think the struts do help control and codify everything with my setup.
jefe