Since I didn’t see it mentioned, are you after a gas truck or diesel?
At $61k, if the one you’re talking about is a diesel you better go get it before I do!
About the whole idea, I’m also near Seattle and just about to turn 54. (Maybe we should go have a beer?) I’ve owned truck and camper combos since the ‘80s, lots of them.
The first time I put my camper on a dually was the last time I ever considered having a SRW. Mine is also my daily driver. I tend to park way out in the far side of parking lots, I’ve always done that anyway to avoid the “K-Mart rash” on anything I drive.
Really, your mirrors already stick out further than the extra wheels do, it fits pretty much wherever any truck the same length does.
I just have 235/85/16 tires, rated 3000 single, 2700 dual. That gives 6000 for the front, 10,800 rear capacity. You’ll have zero capacity issues.
No matter what you do to stiffen a single-wheel truck, the extra track width on the dually makes it more stable.
I’ll admit one down side, and it’s not a deal-breaker. When we had that freak huge snow this last winter, the truck tossed around more because the snow ruts were mostly SRW-sized. But it still went everywhere I pointed it. (4x4 of course... never buy a 2wd in Pacific Northwest!)
For a heavy camper, the dually is the right truck.