I'll throw in what I've been told and observed. If you plan to buy a truck the best time is late spring and summer. Yes some of them ride as smooth as a car. I love driving our Silverado when I need it and can pry the keys out of DH hands
Actually I think it rides smoother than my Escape. I had to drive a friends Ford 250 to the dealer for them and it drove and rode like a dream. Have been told that in the Midwest the best time to buy trucks is in the late spring and summer. The middle of the winter especially after a storm you aren't going to get a deal. As far as RV's we've never bought new for the basic reason that we pay cash for them and have no desire to pay big bucks or interest on something for recreation that we can only use maybe four months out of the year. However our four units have been 6-7 years old and purchased from retired couples who had pampered the units. All of them were purchased in the late summer early fall when the owners were either moving, trading up but wanted more for the unit than the dealer offered, or didn't want wait until spring to sell it and have to pay for the winter storage. Dealers are going to offer lower prices at the end of the season too. I imagine the "season" depends on where you live.
I believe that Laura is telling you the truth about the cost of living in CA. My sister and all of her friends who moved to CA in the late 60's and early 70's have retired and moved back to the Midwest because the cost of living was so high in CA. All of them had very good jobs with excellent retirement benefits. I know that you love the San Diego area but as someone else mentioned it's expensive.
You have mentioned on several occasions that you will be receiving inheritance from your dad's estate. My suggestion is to use that windfall to secure your future on something that will appreciate in value. An RV is not likely going to do that especially if you just plan to use it for recreation. I don't want to squelch your dreams but even if you are one of the younger members of the forum retirement is not that far away. You have also mentioned that you aren't sure how much longer you will be able to take the strain of being on your feet all the time as a cosmologist. Right now things don't look that favorable for seniors in the future. JMHO
My mind works like lightning...one brilliant flash and it's gone.