I always check the kicking tires blog car seat check:
https://www.cars.com/articles/2014/05/2014-land-rover-lr4-car-seat-check/
They could fit 3 seats in the 2nd row and 2 seats in 3rd row but with issues.
If you ever watch Alex ***** (Alex on Autos) car reviews he tests car seats as well. The biggest variable he finds in reviews is the make and model of car seat. Go with the bigger bulky framed Britax seats like we have (three kids) and it is troublesome to fit them.
Wife and I tested almost every crossover and SUV when are family grew from 1 to 3 children. We needed something that fit 3 car seats, a few dogs, grandparents, and a lot of luggage. I did an extended 24 hour test drive of a 2 year old used LR4 which is a great credit to Rocklin CA Land Rover... While I loved many many aspects of the LR4 it came up short in a few points:
1. 2 car seats installed in 2nd row would not allow passenger seat to recline without hitting car seats. Mind you we have bulky car seats and you could easily buy thinner ones.
2. Trunk is miniscule when using the third row.
With all our kids, cargo, family members, and pets it seemed clear that any family road trips would require something bigger. The MDX is even smaller than the LR4 and while it drives nice, that isn't enough with a family. The Volvo XC90 is slightly better room than the LR4 in the trunk but not nearly enough. I also have concerns about Volvo build quality and components QA after the Chinese buyout. When checking it out in person there were some parts that seemed flimsy. The rear hatch latch broke during our test drive! I honestly think the LR4 could be more durable than the Volvo.
The only unibody SUV which seemed roomy enough for our family needs is the Mercedes GL/GLS. While the room was nice the seats were hard. This doesn't help our family members with bad backs. They tested it and couldn't get comfortable. We even tried the upgraded sheep skin seats but they felt like the same foam cushion under the skin.
We used to own a 2007 BMW X5 and it is cramped. It also had severe electrical issues to the point of randomly dying while driving. Never again!
Audi Q7 didn't seem roomy enough for the steep price.
We then went up market in our testing and checked out the full sized body on frame SUVs:
Nissan Armada/Infiniti version
Toyota Land Cruiser/Lexus LX
Ford Expedition/Lincoln Navigator
Chevy Surbuban/GMC Yukon XL Denali
Dodge Durango (actually unibody)
Based on seat and ride comfort, room, third row seat comfort, seating capacity, longer warranty and value we chose the 2015 Lincoln Navigator L (Long) 4x4 base model with sunroof and 22" wheels. While I don't really want such big wheels it is the only way to get electronically dampening suspension.
If I were in the market now in late 2017 the new 2018 ford expedition would be high on our list. It gets the same exact average MPGs as the ford explorer! The loaded XLT model with FX4 off road package looks really nice.
The only issues in 30 months of ownership with the Navigator is a loose interior trim panel (broken clip) and a noise in the ceiling A/C vent (a piece of tape in the ceiling came loose and was flapping in the A/C air flow). Nothing mechanical or electronic.
The Nissan/Infiniti didn't have a very big trunk and I'm concerned for nissan reliability.
The Toyota is a great product but small trunk, poor third row comfort, and front passenger seat didn't recline enough for the Wife.
The Lexus LX570 had better cushions and reclining but same third row comfort / trunk space issues.
Dodge Durango is a narrow vehicle with small trunk, not very much room.
Chevy Suburban has had quality and reliability issues. It wasn't that comfortable and third row comfort is crap. Visibility out the tiny rear hatch window was terrible.