How many miles on your new rig?
Here's a reply to your questions:
1. The rear driver side leveler was super slow to retract. I wasn't sure it was going to make it.
==> Spring tension pulls up the leveler, but maybe you just need to spray WD40 on the shinny cylinder.
==> Maybe your fluid it low in your HWH jack system? (Check with your slides in the correct position? ...Which position is that? IDK. You need to find out for your coach model based on the number of slides you have. Then fill the tank if needed with Dexron III (No high mileage type). ...Better still get a 12V scavenge pump and replace the HWH fluid all together. It's cheap enough and it's been a long time... My HWH reservoir took 7 quarts with ONLY my passenger slideout extended.
==> Maybe you HWH motor has a weak ground. A lot do and then one day "nada work". So this summer I cleaned the 2 screws that hold the motor to the HWH system block (and which provide the ground) and then I added a separate ground wire.
Go to this thread for more information on how to fix. It's not hard if you have these tips. See Post #9 for pictures and more tips:
2. Generator doesn't power the outlets or microwave?
==> Check for generator fault codes. Do you have any?
==> See the attached pdf I created. It has Onan notes that may apply to your generator if you have a Quiet Diesel 7500. Do you? Of course some of these tips and fixes are for future reference.
==> Check your transfer switch (my Horizon has uses an ATS-5070 transfer switch) connections and look for any burned or arching indications.
Note: Your Genset will put put-out L1=120V and L2=120... just like your shore power 50A service. You do have 50A service right?
...And the transfer switch is supposed to give priority to your Genset over shore power.
...Does everything work on shore power, but not when the generator is running? if so, unplug the shore power cord and use a hammer to give the transfer switch a few wacks! ...If this gets your genset to provide power to your coach then you are good-to-go for a while, but at some point you will need to probably replace your transfer switch. Also, banging the transfer switch may or may not work. Some say it will.
...You also should verify how much voltage you see at the transfer switch, since you have the box open anyway.
However, if you are not familiar with electricity, don't cut your teeth on probing for power. Ask for help from someone who can show you how to use a volt meter. It's not hard, and maybe you can watch a YouTube video.
Just remember, when you work on anything electrical, make sure you are not connected to shore power and you don't forget to turn off your inverter off.
Better still you should disconnect the positive inverter cable from the battery bank too!
Good luck and I hope you enjoy your new ride!