First of all, Hwy 1 from Leggit southbound on Hwy one is a RED route which means Motorhomes over 40 Ft are prohibited so that leaves you out unless you want to break the law. Besides that it is narrow, winding, tight turns and the co pilot is next to the cliff in some parts so he/she gets a scary view of the ocean. I don't recommend this drive in your MH. Stay on 101.
Here is a link to the Cal trans site. When the site comes up, click on number 1 on ths map and look for the red rt on hwy 1 from Leggit south. then you can also click on number 4 for the rest of the state and so on.
Cal rans map