The only 'real' numbers include depreciation or replacement of your RV. Many do not consider replacement costs prorated on a monthly basis as part of the true cost of full timing. RV's wear out, at the end of it's life are you planning to hang it up or get another one and keep going? It is a very real and not insignificant cost. If you need a new pickup sometime in the next ten years for the KZ you will spend upwards of $40-50,000. That is $350+/- a month replacement cost over a ten year period.
This has always been a major concern of mine. My plan as of now is to cash out my company retirement account and purchase new truck/fifth wheel the day I file my retirement papers. However, the financial markets may change and put a kink in my plans but barring a complete meltdown, a new truck will at least be in my future. This account is different than my IRA/401K account. I do have some play in my retirement numbers and the 7k draw should still allow my account to continue to grow provided the markets stay stable. I carry a 15k credit card with me when I travel so hopefully that would cover any major expenses that may come up.