You didn't tell us the size of the MMM or the pickup, nor whether you're going to be driving on a slow level country road or a curvy high speed freeway. I presume this a one time trip or will you have to do this more than once? That means that any opinions we give you re. yes or no are just wild speculation. The answer is: it all depends on a bunch of variables.
I suggest you do this. Go measure the bed of the pickup you're talking about. Measure between the wheel wells and between the walls, also from front of wheel wells to front of bed, and back of wheel wells to tailgate. See if BX with MMM attached will fit. Now calculate whether you could fit the tractor if you took the MMM off and transported it on its side in front of the tractor, or in a separate trip. Check the carrying capacity of the pickup: is it a tiny VW Rabbit P.U. or a monster crew-cab dually with extended bed; what is the rated cargo weight? Do you have adequate tie-down points to really secure the tractor: where are they (corners, side, top of wall, mounted in bed floor); how many are there; what is their rated strength?
The answer could be yes, or it could be no. Use your math skills, as well as some good judgement about safety. After you have some numbers and the model of the P.U., if you still aren't sure, come back here with some specific statistics and I'm sure people will be happy to give you some better informed advice. The more info. you have, the better the advice and decision.
BTW, It could be easier and/or cheaper to rent a U-Haul truck with enclosed cargo cabin than a pickup. I had a friend who was moving once and couldn't figure out how he was going to transport the extra car. He finally just drove it into the back of the U-Haul with all the other stuff!