Ohio driver here too.
Look, being thrown in the blind with no training isn't a new thing that UPS just learned to do, it's happened to almost every one of us. Sure it sucks, but we manage through it.
Although this site is a cancer of jaded employees with very little to offer other than insult, there have been a few comments you've brushed off as not acceptable.
1. The eBay craddle: no, you are not allowed to buy one and install it in the truck. It's not your vehicle and you are not a UPS mechanic.
2. Get a map book so you know where streets are and how they run. We used to use them all the time, Orion is new maybe 4 years old now, still very inefficient.
3. It's peak season, prepare for a month and a half of the same route every day, they tend not to move people around a lot during peak.
4. What have you been doing during your 2 years that you have not learned the little things. Like positive numbers on one side negative on the others, as you head north numbers get bigger or smaller. Not sure which way to turn, Right is probably the best bet. Where to look for numbers for a house? Deliver 1 street look at all the signs, turn around and do all the streets you just passed.
These are basic skills that a vast majority of drivers hold. If you work 14 hours a day every day during peak on the same route then I can't help you because you've clearly not learned anything.
Also it doesn't seem like you want to know how to deal with the problem but rather that you want to hear that you are right that you should be allowed to install a cradle in your truck.