I wasn't aware there were any plans. Is this new? Or are you referencing the type of Starlink service you want to buy? With Hughes and ViaSat, you can buy plans, and those plans offer certain amount of "priority data" before your speeds are diminished.
With Starlink business, residential and RV users all get the same data allowances. The only difference was speed, but that wasn't dictated by a plan, it was governed by the dish that you were using. The older dishes were slower, the newer ones are faster. Business services got the newer dishes by default.
The differencing attributes between the services was that RV speeds were downgraded first, residential went next, and business services remained unscathed. Thus the difference in pricing.
Since the 1tb data cap on priority data, your speeds are diminished when you hit the "cap", unless you opt to buy more "priority data". As far as I know, this is the same for all users of the Starlink program, regardless of whether you are a business user, residential user, or RV user.
As a user of satellite Internet for many years, I can attest that very few people are ever satisfied with speed and dependability of non-priority data.