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Principal Diversified Real Asset (PRDAX) probably fits the bill, but I'm not too sold on Principal Funds in general. Gives you TIPs, REITs, commodities, etc. Unfortunately going to have to pay a load on this one.
Keep in mind the tax consequences (if it's held in a non-qualified account) as the income distributions on this fund are very high compared to an average index fund/ETF. Tax-adjusted returns, according to Morningstar, bring this fund's performance …