I wanted to point out the first steps of Symbolism betweem Rohan and Gondor. Right now we have two aging kings (or stewards) of the respective kingdoms. Rohan's Theoden his mind is overthrown, Gondor's Denethor, has already, or is about to be overthrown by the palantir. You might want to say that the friendships aren't really at the bests either. Denethor hates Sauron but also hates anyone that doesn't fight under him. Theoden is an old man listening to bad councilling. Grant it, these two kingdoms don't "hate" eachtother, but they seem distant, seperated, they aren't as strong as they used to be. I actually think a big reason why Theoden decided to ride for Gondor was to keep true to the Oath of Eorl. Anyway, that's the current situation.
Now, we have Aragorn and Eomer meet. Both are future kings of their respected Kingdoms, but they aren't kings right now. It's the friendship that these two future kings create, which will symbolize the strong bonds between Gondor and Rohan that are to come in later days. For these two do create a strong friendship, and they continue that friendship after the war.
Also in connection with these two future kings are their enemies, Saruman and Sauron. Right now Rohan's enemy is Saruman, and Aragorn comes to aid to help out Eomer (and Rohan) win the battle of Helm's Deep, and defeat Rohan's enemy, Saruman. Later, Aragorn's (Or Gondor's) enemy is Sauron. Eomer (and Rohan) ride out to the aid of Gondor, and defeat their enemy (well praise Eru) Sauon. Rather interesting, and I love this symbolism between the friendships of these two influential leaders, that's all I have to add.
