Do vehicles still require to be covered 50% or greater by cover to benefit from it? Are they treated any different than troopers?

The 50% covered for getting cover isn't a rule, it's just a suggestion. Before any game you and your opponent must decide which pieces of terrain gives cover to each type of units and which type of cover.
Just to clarify any further, if you decide for example that a piece of terrain gives light cover to troopers, then during the game if any part of the defending trooper unit is covered from the attacker (including the base), that unit benefits from that light cover, it doesn't have to be 50%, it could be even 1% that is covered.

Lemmiwinks did a good job summarizing it, but it really sounds like you should re-read (or read?) the Cover article in the Rules Reference Guide. It's the most nuanced part of the game, and it sounds like you haven't read the actual rules for it - it could be very different from what someone taught you.

The number 50% does not exist in that article. It does say that half or more of the minis in the unit must have some line of sight blocked.

It also matters whether you're talking about vehicles or repulsor vehicles, because models with a clear plastic peg do not include their peg or stand when checking for cover.

Read through the Cover article, then ask if you have any more questions.

1 hour ago, Lemmiwinks86 said:

The 50% covered for getting cover isn't a rule, it's just a suggestion. Before any game you and your opponent must decide which pieces of terrain gives cover to each type of units and which type of cover.
Just to clarify any further, if you decide for example that a piece of terrain gives light cover to troopers, then during the game if any part of the defending trooper unit is covered from the attacker (including the base), that unit benefits from that light cover, it doesn't have to be 50%, it could be even 1% that is covered.

If I recall correctly, you also have to check if the potentially obscuring terrain interrupts a line drawn from the center of the leader of the attacking unit to the miniature behind the terrain. If it does, then the model counts in cover, if it does not, then the miniature is not in cover. So if just the left hand edge of the base is obscured, the model may be in the open, because the line from center to center may not pass through the terrain (Page 24: Determine Number of Obscured Miniatures).

Right... it’s basically a four step process. One of those steps occurs before the game starts. The 50% rule applies in your pre-game determination, but not when the unit is actually being fired at.

Step 1: before the game, determine what terrain provides what cover to each unit. As a general rule, if the unit can be placed behind the piece of terrain and at least 50% of the model is covered, that piece of terrain provides cover for that unit.

Step 2: when attacking a unit in game, check line of sight to determine if any portion of the defending mini is obscured by a piece of terrain.

Step 3: if the piece of terrain in question obscures any portion of the mini, and that piece of terrain was determined to be eligible to provide cover to that mini before the game, proceed to step 4.

Step 4: draw a line from center of base to center of base. If the line crosses the terrain piece in question, the defender receives cover.

This can lead to some immersion breaking situations, like when a unit is on the edge of a flat surface above the attack, but otherwise mostly visible. Captain Rocket does a good job covering all these situations in the “Everything I know about LOS and Cover” thread on this forum.

3 hours ago, Orkimedes said:

This can lead to some immersion breaking situations, like when a unit is on the edge of a flat surface above the attack, but otherwise mostly visible. Captain Rocket does a good job covering all these situations in the “Everything I know about LOS and Cover” thread on this forum.

Why thank you kind sir! (curtsies)