2X speed AGMu, DKGU-5, MUV-69
AGMu, DKGU-5, and MUV-69 with just over 2x the construction ability and worker count. Slightly slower as the weight is higher, but with twice the resources and workers they build considerably faster while making significantly fewer return trips.
I recommend this to go with this pack:
Super Kzh
also you can take a look at these for even more options
EDK300_V2
MUV Tunneller
UK-25 Extended