Good luck man
... but may I suggest you just sell that motorhome for profit and buy a stock truck and start your project from there. Converting that motorhome is gonna be LOTS of money and even more time... It looks like you done some research, but I'm still not sure you know just what you're getting yourself into...
And I can pretty much guarantee you will run into problems... even guys that have been working with toyota's for decades run into all types of problems... Anyway, just my
Hope whatever you decide works out for you.
