[72suburban4x4cummin?]

So im doing a 1/2ton 4x4 suburban my 350 just dropped a lifter but engine was strugling before...so im going to do a cummins swap. Im trying to pull a 8.5x24 car trailer with 2 cars (small) im looking for any info on front crossmember kits or plans to swap in a 12v 6bt cummins...also general help with such a swap...