We have a 15 or 18 gal. Barker, though I must admit it doesn't have the features of your 42 gal model. Ours doesn't have an attached handle, rather a metal contraption that slips thru the molded plastic handle of the tank that cradles the tank at one end and the other slips over the trailer ball. Sturdy wheels and axle, so it can easily be slowly towed to the dump station. Have to do the grey tank in a couple trips, the black tank I just empty to the capacity of the tote and wait til we leave for 'the big finish' if the black tank isn't filled again. But I would agree smaller might be better.
