I have both tiny spaces and SAS so things aren't looking great for you.
Have you hauled something heavy, cause I did once and I think I bent my leafs a tiny bit. 22ft boat. Bad idea.
Just as a precaution, i'd check torque on the u bolt nuts.
And as fer a load damaging the spring pack, it would either have to be obscenely heavy, or be there for a really long time