Thank you all for your replies to-date.
I should have been more specific. I am considering a battery post mounted disconnect switch for the chassis battery, and a screw terminal mounted disconnect switch on the house batteries. I use the posts on my house batteries for easy-access external charging. I no longer have a battery tray so the posts on my sealed AGM batteries are great for that as shown in this picture.
Panel mounted switches like fandj had installed during the construction of his rig, and those sold at West Marine would be ideal, but for me with my PC, that requires more installation effort than I am willing to consider at this time.
Are there any other battery mounted switches aside from the blade and dial type? I worry the dial may come loose and the pivot on the blade will be an issue over time. You know how it is......problems never surface at the right time, place, and circumstance.