I'd consider a dolly. I'm going with an automatic for bracket racing so I'd have to disconnect the driveshaft to tow. A small inconvenience for the money and storage saved.
I also considered a tow bar, realizing that I'd have to fabricate some brackets and cut out the bumper. Either a tow bar or dolly still leaves me with a problem if something like an axle breaks but chances are that won't happen.
kazman, I'm glad you mentioned the length. I was wondering if I could get by with a 15' ?
One's Nice, One's Nasty