You can try a shipper or a towing service. I realize that you would rather enjoy the good feeling of towing the Excella yourself but I compliment your good sense to know that you do not have the TV to do the job. I know the Sierra well and getting a large tow over them can be challenging even with a suitable TV. Don't rush into finding a tow vehicle for yourselves. Research well. Do you still retain your British accent? My mother came to the US when she was 28. When she died at 91 she still had her delightfull accent. Dad did too and he was here for over 40 years when he passed on.
Neil and Lynn Holman
Kirk Creek, Big Sur, Ca. coast.
1966 Trade Wind
1971 Buick Centurion convertible
1969 Oldsmobile Ninety Eight