Check out JacobAziza's posts, he's got a 250 diesel as well.
Yes to the topper, but try to find one that has a steady slope to just higher than the top of the trailer from the cab extension. The overall profile should show a slope from the cab roof to just higher than the trailer roof.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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