This could work, but I think that there is a little different way to build Hecarim-little more snowbally and maybe (at least for me) little more fun.
On your firsth back you usual wont need Hunter's Potion, just Refillable Potion, and its better to go strat for Boots of Swiftness. (so your ideal firsth back should be this: Boots of Swiftness, Refillable Potion and a Control Ward). Than yes, Trinity Force, Youmuu's Ghostblade and Dead Man's Plate. Last thing, I usualy dont finish jungling item on Hecarim, its better to adapt, for example: If they have vaigar and Warwick (or just 1 of them or any other havy cc team comp) take Quicksilver Sash into Mercurial Scimitar (thats 1 of the reasons I dont take Mercury's Treads). And for a tank Hecarim, I really dont know, I have no expiriance with that.