Space seems to be the great equalizer. Because some of the large vehicle need a lot of real estate. And even the upscaled X-wing needs a fair amount of space!
I've been working on my basement as a collecting space for a while. And some of the big vehicles are also big challenges in terms of where to put them and whether or not to display them at all!
PT / CW - Naboo Royal Starship, MTT, Fambaa (a creature, sure, but it's as big as a vehicle), AT-TE, Republic Gunship (of which there are 7 different versions), Clone Turbo Tank, Republic Attack Shuttle, Slave I (CW SOTDS release)
SOLO / ROGUE ONE - Solo Falcon, AT-ACT
OT - BMF Falcon (3 different releases, plus any of the 2 or 3 previous Falcon releases based on the Kenner mold), AT-AT (Kenner & POTF 2 releases), Big AT-AT (2 releases), Sandcrawler (OTC version or Disney release), Imperial Shuttle (vintage and 2 modern releases) & Sail Barge, Slave I (TVC releases)
These alone take up significant amounts of space. And I didn't really get into a lot of the fighters. The number of Jedi starfighters alone is crazy! I think that unless you've got a huge space, you're probably going to have to make some choices about what you can choose to display. And I didn't even list any playsets or Black Series vehicles (looking at you, Black Series FO TIE Fighter!).
I wound up selling off some older versions of vehicles. Because space and money were both considerations. I had never opened the OTC version of the Millennium Falcon that had the new electronics and the engine lighting, but was essentially the original Kenner ship. I got that in '04 and it was sitting in a box in 2008 when the BMF came out. Plus I had the POTF2 release already open, too. It was pretty easy to say goodbye to that OTC Falcon in the name of just making some space. And what about the Imperial Shuttle? I have a vintage one that I scored before Hasbro re-released it. And I know I have at least one of the Hasbro releases, but I'm at a point where I'm not even sure if I have the Saga release, the TSC release or both.
I see some people who have made Yavin Rebel base hangar displays, and I'm majorly impressed! But I also wonder how they would manage to display that and much else. Sure, there have been multiple Red 5 releases. But there are 4 character specific X-wings from the Battle of Yavin, plus at least 4 OT Y-wing releases. Finding ways to display these is challenging.