Your plan to know how much power you typically consume in a 24 hour period is a good one. However, I doubt 2000 watts of panels would physically fit on a 33 foot RV's roof, unless they were installed above the AC units on some type of rack. Trying to wedge that many panels in between AC unit(s), antennas, roof vents etc. would likely result in shading, which would render a panel, and any others connected in series, useless. Do you have a real need for that much power, or are you just "going big?"
If you scour the web, you'll find some who suggest 100 watts of solar for every 100 amp hours of battery capacity. After nearly two decades of relying heavily on solar, I don't find that recommendation to be very realistic. It's just not enough solar to fully recharge lead/acid batteries that get used like most RVers use them. It may look doable on paper, because the output of solar panels is measured in lab tests under ideal conditions, but in my experience, it's not enough solar.
I've installed several solar systems and I usually recommend 125 to 150 watts of solar for every 100 amp hours of battery capacity, but it really depends on what the RVer wants to do. Do they want to replenish some, or all of the power they use? Clearly, your goal is to replenish all of the power you use. That was our goal too, and we achieve it with a lot less than 2000 watts of solar, even though our coach is one of the more power hungry RVs.
As a frame of reference, we've got a 960 watt array and eight Group 31 AGM house batteries, with a total capacity of 840 amp hours, and we almost never have to run our generator. A lead/acid battery bank with 2000 amp hours of capacity (to match a 2000 watt array) would require 19 similar batteries. At nearly $300.00 a piece, that's gonna be a pricey (and heavy) battery bank. Do you even have enough room in your RV for that many batteries?
Of course you don't "need" to have a battery bank with enough capacity to store all the power your panels generate, but it's kind of an expensive waste to buy solar panels and then not use the power they produce. Having said that, there's something to be said for having extra solar power - for a stretch of cloudy days, but a 2000 watt array would be serious overkill for most RVs... IMO. If you installed a lithium battery bank, you could get away with having a lot less battery capacity, and it would take up a lot less space, but the cost would be astronomical.
Kev