Bummer. I just went over 108 the last week of April a couple of days after it opened. I was gonna stay at Leavitt Meadows campground, but it was closed. I should have checked out Leavitt Lake. Great area (sure not much snow there this year, really dry).
Re Saddlebag: it's a USFS campground, and run by a concessionaire. When I was on the east side in April the concessionaire was opening some high campgrounds, like Onion Valley, before the dates that the USFS had on their websites. Given the lack of snow, they might open early. I don't know how to contact the concessionaire directly, but they might have the most up-to-date info. This was true of Inyo NF; Toiyabe didn't seem to be doing that. Onion Valley was already clear of snow, as was the Whitney trail up to Lone Pine Lake, and the road up as far as the closure at Tioga (although I heard clear as far as the pass, but can't confirm that).
I occasionally use an Outback Oven we had for backpacking and rafting trips; works well with a small stove although it's limited in that you use essentially what is a small frying pan. So good for slow cooking or baking stuff that fits in it, like biscuits or scones. I noticed Coleman now makes a combo stove/oven that looks like a toaster oven, but it's super expensive.
Love the boat set up. Would the van float on them if you turtle it into a lake?