thoughts about car battery keep hooked up OR disconnect ?

You can buy various devices "right on the battery post" they are a switch that mounts right there. Problem of course is finding one that is decent quality

I agree with above^^ if it's only "a few weeks" and you have nothing with parasitic drain, it should be fine. Modern radios have a "keep alive" for the memory, and that drains a bit, and some alternator diodes "leak" more than they should