A rotten egg smell is a sign of a bad battery.
https://www.cuttergmc.com/the-traits-of-a-bad-car-battery-that-you-cant-ignore/
I once had a trickle charger bake a battery and it stunk up the whole garage.
I'm helping my daughter through a similar situation and have found that many repair shops in Denver won't do an out of pocket repair. I've never run into that in Seattle. So, depending on where you are, that might be a barrier. You should ask for at least two estimates and ideally three...
Geography also plays a huge role. Seattle, where I live, is built on seven hills. No vehicle with an internal combustion engine gets anywhere close to EPA/DOT estimates.
The keypad was not on my list of accessories when building my Maverick on Ford.com. When I pivoted and purchased one off the lot, it came with the keypad and I figured I would never use it. Fast forward to yesterday. The kid has the keyfob and I'm at the truck 10 min earlier than we had planned...
The dealer that had my Maverick also had a $2500 markup on it (reduced from $5000 - greedy jerks). I worked with a dealer that was in the Costco program to try to have the truck transferred to them as they would sell it to me at MSRP, but the first dealership refused - even when the Costco...
Payload capacity doesn't make any difference to me. I simply like the styling of a pickup. Owned a 1986 Mazda B2000 for 17 years, a 2004 Ranger for 11 and now the Maverick. The number of times I had any sort of significant payload is probably fewer than a couple dozen.