I don't, but I saw a guy who did.
He just had a 2x4 that he C-Clamped to his tail gate (or the bench too, I'd imagine) with a single stage bolted to it. THe 2x4 hung about a foot off the tailgate, with the press out there. He had the scale on the bench and was loading somekind of big bore rifle round. He'd shoot a couple rounds, then let the barrel cool down while loading up a couple more.
I've also heard of people having small portable benches made up that they haul out to the range.
"Dreams only have meaning because we struggle in the waking world."
-- Major Motoko Kusanagi GitS:SAC
Member of NRA and Western Missouri Shooters Alliance