About to hop over to the France soon, via the Eurotunnel in the 2013 RRS. Last April I went via MyFerrylink, but this time for speed of ops, thought to go via the Eurotunnel (one way), Dover - Calais. Apart from being twice the price of MFL who are for now the same company, the add on costs for pets are £16 per pet, in my case £32.00. Whereas MYFL no cost. Why, if you are going to France from the UK would you have to declare pets on a single journey? Apart, from extra profit!
Also, I think I read somewhere on this forum, that the new RRS being wide, only just fits in the space, so potential for the 22" wheels to be curbed is possible. So, is the best idea to go for high car with roof box...does that get you into a wider carriage?

Been a few times with no issues regarding width. The "kerbs" are only about 3 inches high anyway so you should be fine  MY16 AUTOBIOGRAPHY Indus silver with some toys

2012 3.0 SDV6 Luxury gone, but a great motor

The carriages for high cars are wider too. People with caravans and motorhomes also use these so plenty of space. My RRS was the only solo car in our carriage when I used it last time. Price is the same (at least if you book well in advance). Make sure you get in the correct lane before boarding - I almost entered the regular car lane

Ok, good info. I seem to recall last year, in a Disco 4, I booked a high car as it's higher than the RRS, and being in the same carriage as vans etc.

Here you go MY16 AUTOBIOGRAPHY Indus silver with some toys

2012 3.0 SDV6 Luxury gone, but a great motor

Very good photo, thanks. But the new RRS is much wider than the 2012, I think it would be touching the kerbs!!

Full fat Range Rovers go in OK, never seen a new one though. 2023 P440e SE Dynamic on order -cancelled

2022 HSE Dynamic P400e

2017 Discovery 3.0 HSE Silicon Silver Nimbus interior and a few extra toys SOLD

2013 HSE Black, Orkney Grey, Ebony Seats and Ivory Interior SOLD

2006 HSE

Plus a few other cars inbetween!