I've never heard anything like that. It's already a very high vehicle. Can't see how you would add an MLRS module onto it without having it tip over in a strong breeze.
It does have enough capacity to make a decent OPV or STA platform with the right add on stations, but that makes them stand out and be priority targets within a LAV company. (There's a lot of benefit in looking like all the stuff around you when you are special

)