3 months ago...We just came back from Pismo Beach area. Going and coming using I-5 from Tracy - Manteca (120) down around a 130 miles to Kettleman city turnoff highway 41 out to Paso Robles.
Our motorhome took a beating where the concrete bridges or short concrete strips adjoin the asphalt on I-5.
I slowed even to 35-45 with no traffic behind me and we still bottomed suspension out. I counted at least 10 different spots on that leg of the trip. So, just a warning, be prepared to loosen some teeth.
Next trip, I may try 99 part way starting at Merced north. We have used 99 north from Stockton to Sacramento and then cross over to I-5. It's fairly smooth. I-5 around Stockton is all torn up.