Clearly shows the versatile rear door arrangement with a small opening door inside the main ramp door... for putting gear into the vehicle the small door is fine while getting out or in in a hurry the ramp allows speed and numbers to get in and out faster.
I meant drop them a little ways off the target area, then drive them there. It would be very fast. VDV can do low altitude drops, which increases accuracy.
Keep in mind that a strategic target will have significant air defences even if it is well behind enemy front lines. However it may not be that well defended from ground attack being again so far behind the front line.
This means that landing forces even 100km away from the target means the enemy will not have air defences ready to oppose the landing and will wonder about what your target really is and may have to mobilise reinforcements to several potential targets.
With modern light fast vehicles 100km could be rapidly covered and your armoured force could take on the small ground forces defending the target fairly easily with heavy fire power. they can take out the air defence units at an airfield and once captured that airfield could be used to land heavier forces and allow a foothold deep in enemy territory to be established.
Heavier units could be landed that could oppose any heavy counter attack the enemy might mount in response to your action.
Regarding riding on the vehicles it is common in most countries to ride on vehicles when the risk of actual combat is low, but the risk of mines is high.
the risk of IEDs means it is probably safer inside the vehicle than outside, but with land mines if you are on top you might be able to jump off and survive a mine if it hits the wheels on the other side of the vehicle.
Equally an RPG or ATGM attack on a BTR could be survivable if you are on top and see the incoming missile and are able to jump clear.
You also might be able to return fire in an ambush situation where your chances of survival might be better outside the vehicle depending on the standard of ability on the part of your enemy.
A few MON-50 mines aimed at the vehicle from a few different angles makes it much safer inside than on top.
Most soldiers will play it by ear... if they hear rumours that the enemy use PKM MGs and RPGs to attack vehicles and that you are safer inside then they will ride inside. Equally if they hear the enemy like IEDs packed with nails and glass they might also think inside is the place to be.
Otherwise if they believe the enemy is not that aggressive and a few land mines are most likely with no actual armed attack to follow up then sitting on top might be considered safer.
These new heavily armoured vehicles will likely make sitting inside the safer option.