Rather than go thru all that work & expense of getting a carriage, buy a standard reach truck with the out riggers spaced wide enough to fit the users pallet - rule of thumb is the ID should be a 4" wider (some people might say you need only 2") than the pallet width being used (in straddle truck operations all the pallets must be the same width. Also, make certain the unit is fitted with load wheel protectors on the leading edge of teh straddle arms (saves a lot of load wheel damage/repairs & down time. Most pantagraphs have the carriage supports & rollers built integrally - you woudl be taling about buying a straddle truck carriage to fit the machine - that would be more rare than find a straddle truck)