The Bike-Hod Traveller has large spoked wheels for a smoother ride.
The Traveller has a wider wheelbase - using extended stub axles (54cms as opposed to 47.5) between the wheels on the Carryall frame so the load tray area is the same but will allow for the bigger bag, but primarily better stability for fast road riding.
Good looking 16" stainless radially spoked wheels on aluminium rims, and high quality bearings plus Schwalbe Big Apple tyres, 16 x 2.0.
Larger mudguards of course on the same mounting tubes. The Traveller frames have a longer parking foot but the standard Carryall can have an upgrade kit.