Hmm, would definitely replace
horse of rohan with
Brego(simply better).
Also would try to squeeze in some
arrow-slits to deal with possessions(for instance
easterling polearm can really upset your deck).
Also can merry return his own sword? It says that you play the possessions from your discard pile, so if he is returned to your hand you can't really play anything on him(at least according to my interpretation). I mean stacking possessions on
gandalfs cart is a fellowship action-so i don't think you can play
merry's sword on it using merry's game text(as normal rules preclude playing possessions on possessions).
On the cutting front I would probably cut
gandalfs cart(you should get your companions out quite quickly with four Faramirs so it would generally not be needed[also very dependant on you drawing it early]).
Would also scrap one
Eowyn's Sword, Dernhelm's Blade, it is a good card but you can only play it once(unless your opponent is nice and discards it from you).