I have pulled a 32' Cougar TT with a Excursion all the way from L.A. up 101 to 1 and then north to S.F with no problem and yhrn from S.F. north all the way to Wash. I did pull a 27' TT with my Suburban from San Rafael to Olema and then all the way up 1 Leggett on 1 and there were several curves that got a bit tight, but only because there was some idiots in their MHs heading south that were cutting the corners.
Do not try the run from S.F. to Olema pulling anything. In fact even tour buses can only go a certain distance up that route.