Dodge 3500 Upper Overload Springs

I talked to a spring shop & they said they could do it but they didn't have the spring in stock & had to order it. I measured the distance between the bump stop & the overload spring & it is about 2.5 inches without the camper loaded. I am thinking that if I can get them to also put a spacer right below the overload spring pack in addition to the extra overload spring, that would raise it almost an inch. That would leave the space between the bump stop & the overload spring about 1.5 inches which would engage the overload sooner & put more of the load on the overload springs. I guess it would be similar to using upper stableloads that engage the overloads sooner.
Can a person put an extra spacer in there & does that sound like a good idea??

Big Rig