First, The ogryn at that size would not fit inside the Tauros. And would weigh it down to an admittedly comical but ultimaltly useless degree. 

Faced with picking up your ogryn I would say no, I would not give you a lift. Because it would not be at all possible in my opinion and in my characters. I can see an agryn riding in an open topped tank chassis. Like a salamander or even some lemen russel variant. But not a light scout and support vehicle like a Tauros. Assuming I even choose the tauros. 

Even if the Valkyrie can carry space marines(and one space marine is arguable, maybe even two if there was no one else inside. But multiple on top of fitting other people inside. They will easily take up the space of two or more people, power armour and wargear 'not' included. And like hell they would fit a full battle squad inside.) they cannot carry ogryns. 

The Valkyrie is capable of carrying 12 troops, but cannot carry Ogryns. That is from the wiki and it repeats itself in the Lexicanum as well. And if I had enough energy to look up the Codex I am sure it would repeat itself again.