While poking arround under the Wagoneer for some undersealing Wax I poked a hole in the sill. More poking didn't reveal more holes. Phew!
The hole was not so bad to weld up, though I had to weld upside down. Halfway the Argon went out and I didn't notice for a while because I had earprotectors on. I was just wondering why the weld went so bad...so I had to grind the weld back and start again. before I closed the hole I sprayed a lot of rustconverter into the sill. I'll pour more wax into the sill this summer.