While Fools should generally take the opinion of Wall Street with a grain of salt, it's not a bad idea to take a closer look at particularly stock-shaking upgrades and downgrades -- just in case their reasoning behind the call makes sense.

What: Shares of Mobile Mini, Inc. (NASDAQ:MINI) climbed 4% today after Deutsche Bank initiated coverage on the portable storage solutions company with a buy rating.

So what: Along with the bullish call, analyst Amit Mehrotra planted a price target of $57 on the stock, representing about 23% worth of upside to Friday's close. So while contrarian traders might be turned off by Mobile Mini's strong rebound over the past year, Mehrotra's call could reflect a sense on Wall Street that its turnaround potential still isn't fully baked into the valuation.

Now what: According to Deutsche, Mobile Mini's risk/reward trade-off remains particularly attractive at this point. "We see 30% upside in shares of Mobile Mini as its relatively new, highly capable management team accelerates the company's transformation from a strong, but undermanaged company to best-in-class with deep logistical capabilities and significant pricing power," said Mehrotra. "The restructuring efforts should translate to 13% and 27% CAGR revenue and EPS growth through 2017, driven by a significant increase in the utilization of MINI's lease fleet and a step-function improvement in profitability." Of course, with Mobile Mini shares now up 75% from its 52-week highs and trading at a forward P/E of 30, I'd wait for a wider margin of safety before betting too heavily on that upbeat outlook. 

Brian Pacampara has no position in any stocks mentioned. The Motley Fool recommends Mobile Mini. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.