I did this job, message me and I will give you all the details step by step. I can save you a lot of time and energy and maybe some money. Perhaps we can get you fully installed for about $4,000 with a LP5500 Onan. 1/2 to 1 full day work with help from DW or neighborhood teen. One thing is for sure, you need a plan to get that thing into the garage, it is not an easy DIY task, the rest is easy. I got the plan. LOL
BTW, I use a separate cylinder, and regulator. And you do want LP. Unless you have some specific reason that you want gasoline. Such as having a Toy hauler with a tank in the unit.
What type generator is installed at the factory for the LP generator? I'm a bit confused on the difference and what is recommended. I had the gen prep done already.