Looking at the typical T match schematic it seems there is no dc continuity between the center conductor of the input and output. Some manufacturers may have a static bleeder of some sort in their tuners. I would check rather than assume. This is another advantage of the double balanced L with a doublet. A resistor or choke can be placed across the (50 ohm) input of the tuner. Even if the expensive moden rig has an internal bleeder would still feel better about having something redundant, or at the very least shorting the coax before connecting it. When using my link coupled tuner the coil can't be grounded with a center tap because the coil has been split for series configuration. In that situation I have chokes on each leg of the feedline. You can roll your own or use plate chokes. For link coupled tuners in parallel configuration a husky ground strap can be used to DC ground the entire antenna.