Roads going to the place coming from Manila is fine. NLEX and SCTEX. Some road construction sa highway after Dinalupihan and bit of roughness sa Road going to Bagac. Some man made humps also but OK overall. Ride quality, of course, could be affected by the type of vehicle you are riding in. And when you get there, do NOT take the calesa ride. it's very bumpy and i would not recommend it for pregnant women especially if they're in the later months. Hope this helps.
Sorry, I am not very informed on this as we came on either a hired vehicle or our own car in several instances as we were always a group. If you can find numbers/email in its website to inquire,that will be best. Cheers!