Oregon Highway 126 is good anywhere you are on it. HOWEVER, if memory serves me, you may find Highway 20 continuing on to Sweethome to have a rather ‘ uncomfortable ‘ drive. We took that section years ago in a 30’ Trek motorhome and found a few miles of rather steep and winding section not to our liking. We resolved not to take that route again. You may find it even more uncomfortable to drive in a 40 ‘ Motor home!
I would recommend taking 126 all the way to Interstate 5 and going to 228 to Sweethome from there.