That's exactly what my thinking was. I can probably throw it behind the third row (only when I take long trips) or maybe get a fabric cover for it and throw it on the roof racks.My .02.
I have always wanted a minivan, since collage days. I like long road trips. Nothing beats minivan for them. I got C300 around our first born in 2010 because I wanted a luxury car too. I figured if you're going out of your way to buy something expensive, you might as well get it soon to get more use out of it. Our 2nd backup car 2001 Prism kept going until Dec. 2020 so I didn't really have a need to buy another car. Prism died sitting unused in parking lot due to Covid, and the timing couldn't have been more prefect. A couple of months early, and Sienna Hybrid wouldn't have been out yet. A couple of months later, and that would have been the start of the supply chain mayhem! (RIP Prism!)
For everyone passing on minivan for an SUV or a crossover, I say good for you (and us too in this tight supply market! IMHO, its their loss ).
Minivans have so much utility, daily practical uses.
Sliding doors, and ability to just "Walk-in (a bit hunched over)" to get kids in/out of the car seats doesn't seem like a chore anymore, especially in rough weather.
Speaking specifically for Sienna, 2nd seats long slides are amazing. I am lounging back there (a lot), when kids are out for dance or sports.
Hybrid MPGs close the deal!
About driving experience, Sienna can't beat a sports car, but you won't completely miss it either. Electric motors have a good kick to it. For reference, our 2011 C300 has 0-60 of 7.1. Our Sienna has 7.5. That's about the same if you ask me!
p.s. If you have OCD for keeping cars tidy, be warned! This is a lot of car to keep clean from the inside, especially with kids. One of these days, I am just going to carry a mop and a bucket all the time in ours .
For spare, link below has my take on it. FWIW, I just picked two of my friends from the airport with the spare like this. I was still able to put their 4 full size, and 2 carry ons back there. The 3rd seat needed to be slightly reclined in, for the last bag.
Nice! I have been dragging my feet to put it horizontally in rear well after deflating it a little. Looks like the the tire is about 28Inces, and the rear well is about 24Inches. Shouldn't have to deflate it too much. I see some silver hooks on the outside edge of the well too. May be some...www.siennachat.com
I plan to carry around a portable but powerful Dirt Devil vacuum because both my wife and I are slightly OCD