I have done Kolkata Bangalore Numerous Times and Last was in June.
Google Suggested Route is better Bangalore~Chittor~Tirupathi~Vizag~Kolkata.
Road conditions were good, and you will get single laned highway with Ghat Sections from Bangalore till you connect the Chennai - Kolkata NH-5 at Naidupeta
You will get few Kms of Broken Stretch after Vijaywada.
After that roads are pretty smooth and double laned all the way till Kolkata.
Vizag to Kolkata I did last weekend, Night Driving took me 9 Hrs and its Doable in 12 Hrs at most, You can Maintain avg. 100Kmph all along if you are driving at night which will change to around 70Kmph in the morning.
Anytime of the day, trucks are not that much of a concern but during Daytime the Village Traffic, Stupid Bikers and Pedestrians crossing the Highway, Tractors and Other Driving Proudly on the Wrong Lane are a BIGGER Concern.
Your Only stop should be at Vizag (try Hotel Dolphin or Winsar Park) The Stretch from Bangalore till Vizag is a tad bit longer but definitely Doable.