If your home state does not require that a dolly be tagged, then you don't need one anywhere else. Off hand, I don't know of any state that requires a tag on a resident owned dolly, but there might be some that do. That won't apply to out of state travelers though.
Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate