Watch Bob the Builder On Site: Trains & Treehouses (2011) HD Full Movie Free on solarmovie.do. Watch Bob the Builder On Site: Trains & Treehouses (2011) online free. Bob and his 'Can-Do' crew are back on site with a brand new adventure! Join Bob as he builds a train...Bob and his 'Can-Do' crew are back on site with a brand new adventure! Join Bob as he builds a train set for Mr. Bentley as a birthday surprise and helps find a family of squirrels a new treehouse home.