On-the-go tethering options for Nikon DSLRs?

I have two weddings coming up in October, and I would love to be able to use my Rokinon 85mm f/1.4 lens, which produces a beautiful asthetic at 1.4, but lacks the autofocus of Nikon's (much) more expensive version. Both my bodies (D300, D700) support live view. I am hoping to make a bracket for a monitor or tablet that I can quickly affix to my tripod while shooting to get crisp focus- this is difficult for my eyes when peeping through the viewfinder, and focus at 1.4 or 1.8 isn't but a few centimeters deep.

Has anyone done tethered shooting on location like this? I would prefer using a very compact set up, instead of a laptop, table, etc. My guess is that all I'll need is a monitor of some sort with a video input? I've seen at least one person use video input on a portable dvd player successfully with a D7000, but I'm not certain if that would work with my cameras.

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