Put the radar on either an APC (if it's expected to operate well forward) or a soft-skin if you believe it will be operating well to the rear. There wouldn't be enough room in an M41 for the electronics, the operators and the radar antenna. You'd need to add a big, boxy superstructure and so you might as well go with a vehicle that already has that.
I'd recommend the M577 ACV as a good starting point. Alternatively, perhaps the M548 TLC. Then you have your choice of trucks, if you'd prefer to go down that route. Remember, radars by their very nature don't need to be right up with your forward troops, so a truck might be adequate.