Just reviving to confirm this. Front and rear B springs go on the DRIVER SIDE on US model trucks. I tried the rear with the B on the passenger and A on the driver side and the truck sag'd to the left by 3/4". Swapped the rears around and now it sits perfect. The truck sits perfectly level...
When it doesn't start does your check engine light illuminate with the key on? If not it's probably the old fuse box issue.
I would not just start shotgunning parts.
Wheel spacers have zero impact on reliability, unless installed incorrectly and your wheel falls off. Congrats on the new truck, jealous of the five speed.
Posting for a friend, I've personally worked on and maintained this truck for the past few years and it's really solid, ZERO rust, service records, lots of new Toyota parts.
The truck is currently located in Oregon but can also be arranged for sale in Colorado. Contact him directly from the ad...
There's a pinch weld or seam on the body behind the rear tires (looking at them straight on) that runs above the frame rail, you can bend it up with a pry bar and then hammer it back when you're done.
It's a great access point to reach the upper shock hardware.