First off, you have some $hitty dealers in your area. But considering my experiences in central NY, you'll want to go Upstate or (more likely) out of state. Really, they're just shitty dealers. No dealer in their right mind that WANTS to keep you as a customer would tell you that your problem is due to a trailer brake controller. As for the loaner, diagnostic should be under an hour, and for that I have never seen a dealer give a loaner. There's a Hyundia dealer that I love, took care of so much under "warranty" (several of the items shouldn't have qualified, but they 'made' them qualify) and unless they KNEW they would need the car for the day, I had to wait for the diagnostic. Once the diag was done, key in hand
for the next filming of Days Of Thunder
. Even when I had an intake manifold failure and it had NO power and could barely idle, they had to verify it wasn't something quick & stupid. Took them 30 min to verify. So your biggest issue is dealer.
As to the actual problems with the truck (electrical). It happens. I had a few minor issues with the truck when I took delivery. Mostly with things the dealer was supposed to do when it arrived off the delivery truck. To test the amperage of the altenator all you need is a clamp ammeter. safe & easy. can do it wet or dry. you can get one from Harbor Freight for $12
. Or just ask the friendly Autozone guys to test your battery & altenator. And while the rear can be a little jumpy when its empty, thats because its an empty truck. Every truck I've had has done that. My father's 2008 F150 does it and that sucker is long & heavy. It also handles worse than my Fronty. He even thinks so. BUT he is a Ford man and needs to tow a 32' travel trailer.
If the fabric of the seats is an issue, a cover will fix that. I tried both Nissan & Toyota and fabric-wise they were both the same (I drove the Toy to the Nissan dealer and had them side by side... lol... watching the 2 salesmen... AWKWARD!!!!) But I didn't like the seating position of the Toy. Or their attitude of "we sell out every month, we don't have to dicker on price" Almost as bad as "its a Jeep thing" Plus, if all you did was go from your old worn out seats to the Frontier and called it good, thats on you. I spent several months looking at prices & options, then several months test driving multiple brands & models.
Oil filter is not that difficult. And you're not supposed to reach up through the access port, thats for the oil to come out of. You flank it from the side... in a sneak attack! (no seriously, you reach in from the side)
Tires: everyone knows (including Nissan, which is why they started offering Hankook) the BFG LongFails are bad. But, they are cheap (for them in bulk), and get good mpg which is what nissan needed them to do.
I hope you find a good dealer or mechanic (an independant can do warranty work also, AND get paid by the mfr. They just have to be willing to do it. Most won't because its a hassle. The dealer does it because they are forced to). I felt the handling was 'wierd' too at first; I was coming from a small car - that's why. The bulk of your handling issues will be corrected by tires & shocks. Even the Pro4X stock shocks will be a noticeable improvement, but if you do that, may as well get hte Bilstein silver bodies (5100) BUT a Good dealer may give you a set of yellow Bilstein (stock P4X) for labor. Particularly if you are telling them of the issues you have and are looking to replace your tires but can't swing shocks... this would come after they have fixed the electrical (because now you have begun a 'relationship' with them and they want to earn business)