I remember seeing a photo of an AAAV-7 with its troop compartment filled with rockets with fuel air explosive warheads for a mine clearing trial, it looked quite impressive.
Back onto the M-113, how about either a Tilly, a Tracked Rapier, Chapparell or the flat bed version of the Australian AS4 updated version with a Sea RAM mount? It just came to mind while I was typing the above.
The chain of thought was an artists impression of a conceptual Israeli truck based air defence vehicle incorporating a Phalanx between the axles and a VLS for 8 Barak missiles behind the rear axle which made me think of Sea RAM instead of Phalanx and then because this is the M-113 thread I thought why not.