Two things that I would like to comment on.
First, I don't know what kind of camping you do, but there are 2 types of surge protectors available to you. One plugs into the power pedestal, and the other is hardwired to your RV. The plug in has the advantage of being easy to install, but is also easily removed if you are camping in a questionable area, where someone might want your protector more than you do. The hardwired unit has the advantage of having a remote display that can tell you how much power you are using at any time, and also will tell you what kind of power is actually coming into your RV. The downside is, it is not so easily installed or removed. (but you will never forget to plug it in) I am getting ready to install this:
Progressive Industries EMSHW50C Surge Protector : Amazon.com : Automotive
The next comment regards your PDI when you pick up your new trailer. I would encourage you to print out one of the many checklists that are available online. I used this one: RV Inspection Checklist
Go through it step by step, and take a good look at everything. It will also remind you to have the salesman/tech show you how every system in your new RV works. I spent 3 1/2 hours on mine, and then handed the checklist with all my notes on it to the service manager who was doing the walk through with me. He told me that it would take a few days to get everything done. They wanted my money, so everything was done by late that afternoon. I went back and checked everything on my list, and after borrowing a TV from another RV, they had mine all ready. I have had a few minor issues since then, but have only been back to the dealer once in a year for a water leak that we could not have found on the PDI (it wasn't raining that day)
Just my 2 cents.