Hi Stayingretired - thanks for your input. I did try and get confirmation from Toyota using the VIN, but they declined saying that had no records now as they 'sold' it onto someone else and would not tell me who....right!?......so as far as I know, there is no way of knowing or finding out. (If you know different, for sure let me know. However, I trust the dude had it done as he appears to have cared for it very well indeed...and why wouldn't he!?
It is an automatic and so I will take your advice and Flush transmission....anything else I should have done while it is at the garage....? I'll also look at the lights and all the seals. No leaks reported or seen, so unbelievable really, but true it seems. I'll be looking out for that though as it is super common on all RVs so I hear.
Many thanks to all the folks here for advising me on this - I appreciate it!