The analyses of a text #3

The narrator recalls his adolescence.
He is an apprentice for the lawyer Mr. Spenlow.
He is crazy for Mr. Spenlow's only daughter Dora.
Peggotty is his old nurse and a present wealthy widow.
He took her to his office to deal with the legal procedure of her legacy.
Here, he met Mr. Murdstone, his old rigid stepfather, making sparks between each other.

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Mr. Spenlow did not appear to know what the connexion between Mr. Murdstone and myself was; which I was glad of, for I could not bear to acknowledge him, even in my own breast, remembering what I did of the history of my poor mother. Mr. Spenlow seemed to think, if he thought anything about the matter, that my aunt was the leader of the state party in our family, and that there was a rebel party commanded by somebody else - so I gathered at least from what he said, while we were waiting for Mr. Tiffey to make out Peggotty's bill of costs.
'Miss Trotwood,' he remarked, 'is very firm, no doubt, and not likely to give way to opposition. I have an admiration for her character, and I may congratulate you, Copperfield, on being on the right side. Differences between relations are much to be deplored - but they are extremely general - and the great thing is, to be on the right side,' meaning, I take it, on the side of the moneyed interest.
[David Copperfield by Charles Dickens]
1. I'd like to know if "meaning, I take it, on the side of the moneyed interest." is the abbreviation of "meaning I am on the side of the moneyed interest, I take it."
2. And I'd like to know what "on the side of the moneyed interest" means.
Thank you in advance for your help.