Just something to consider,
I also was looking at the Lang 60 recently. Because of the distance (also live up in PA) I went with a local pit maker, Meadowcreek BBQ. However, if you are set on getting a trailer mounted pit. Go with the 60, just drive yourself to and from GA where they are built. You can probably drive down there and haul it back for less than it would take to ship. Plus road trips are fun, even better when trailing a Lang 60 for the return. And for the record, I love Queing with my new offset, tending a good hot fire of cherry or apple wood with a little K mixed in is magical.
Meadowcreek SQ36 with 2nd grate, 1991 Weber Performer w/ SS table, UDS, gasser.-Glenn-