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So people think glancing hit hull point ablation is a boring way to kill a vehicle, and the penetrating hit effects table is about as useful as an appendix?

So how about this:

When you score a glancing hit on a vehicle, roll once on the table below (no HP loss unless specified).
If you score a penetrating hit, do one HP damage then roll once on the table, adding a modifier equal to the total HP damage the vehicle has taken so far:

D6 | Result
1-2. Crew Shaken
3. Crew Stunned
4. Weapon Damaged - one random weapon can only fire snap shots until repaired + Crew Shaken
5. Drive Damaged - all movement bands are reduced by half & the vehicle may not turbo boost until repaired + Crew Stunned
6. Chain Reaction - lose one HP and roll again (remember to add the HP loss if this was the result of a penetrating hit)
7. Weapon Destroyed - one random weapon is irreparably lost + Crew Stunned
8. Immobilised - the vehicle may not move again for the rest of the game + Crew Shaken
9. Explosion - the vehicle loses D3 additional HP + Crew disabled - the vehicle can't move or shoot until the Crew come around by rolling ≤ starting HP
10+ Huge Explosion - the vehicle loses D3+3 HP and models within D6" suffer S5 AP- hit + Crew Disabled

Wrecking: a vehicle is Wrecked if it's HP are reduced to 0 or less by anything other than an Explosion or Huge Explosion leave the irreparable, useless wreck model on the table. It is very difficult, dangerous terrain.
Shattered: a vehicle is shattered if it's last HP is removed by either kind of Explosion. Remove the model and replace with a suitably sized debris field if available, or a marker if not; everything within starting HP value in inches is dangerous terrain

Flyers: Wrecked Flyers Crash and Burn if zooming. Shattered zooming Flyers leave no survivors, nor debris field.

Super Heavies ignore results 1-5 but the rest applies as for any other vehicle. Super Heavies that become wrecked or shattered roll on their own table to determine their final fate. Primary Weapons are only affected by Weapon Destroyed results if all non-primary weapons have already been destroyed, and even then are only affected in the same way as a weapon damaged result.

FAQ:
Usual modifiers for AP apply to both glances and penetrating hits, so an AP1 glance will always at least stun, and can immobilise.
D hits determine damage dealt before rolling their penetrating hit result but don't get multiple rolls per hit.
Passenger effects modified as follows: explosion, as Explodes! But not forced to disembark unless vehicle is shattered. May choose to do so though. Huge Explosion, as explodes! but S8 Ap4 hits (must disembark, may re-embark if vehicle somehow survives). Also, the hits on passengers all have the "ignores cover" rule.
Rolling a result that can't apply (e.g. Drive already Damaged, Crew already Stunned) applies the next result up; keep going until you find a result that can apply. Crew can be repeatedly shaken, which has no cumulative effect, and things can always explode more unless the vehicle is Wrecked or Shattered.
Extra armour applies to all Stunned results, including secondary effects.

TL;DR:
Grand Unified damage table that incorporates incremental accumulative damage but still allows solid hits with AT weapons to actually kill a standard vehicle with one shot. Replaces normal rules for glancing and penetrating hits but not catastrophic damage.

An interesting concept, though i feel it needs playtesting. I've got no problem with vehicles be as durable as they where in 4th, but I never want to see 5th ed vehicles again.

I don't particularly want that either; indestructibility is not the goal. Just reducing the mockery of armour all those glance on X+ effects make.

Sufficient glances will still accumulate enough damage that the next glance will chain on a 3+ and keep going until it wrecks, just no more three strikes and you're out.

It would need testing but I like this better than an armor save. I like having a difference between vehicles and MCs and this preserves that difference. I do think some of those "monstrous creatures" that are piloted should be vehicles since they aren't creatures but that is a moot point. It looks pretty cool to me.

If you do play test this, please let me know how it goes.

Also, do you have any questions right now that I can answer/clarify in the FAQ section?

Like I can see some potential for confusion about the bonus mechanic with penetrating hits and also whether a chain reaction from a glance gets the bonus.
But I don't know how clear the rest is (it is of course gloriously perfect in my head but then these infernal "words" interfere and it all goes wibbly…).

 Grimmor wrote:
An interesting concept, though i feel it needs playtesting. I've got no problem with vehicles be as durable as they where in 4th, but I never want to see 5th ed vehicles again.

This is off topic, but I barely played any of 5th ed. How crazy were vehicles and why were they so durable?

 Powerfisting wrote:

 Grimmor wrote:
An interesting concept, though i feel it needs playtesting. I've got no problem with vehicles be as durable as they where in 4th, but I never want to see 5th ed vehicles again.

This is off topic, but I barely played any of 5th ed. How crazy were vehicles and why were they so durable?

I dont remember why exactly, but glancing things to death was damn near impossible. Ill just say that Imp Guard where horrifying with hordes of Chimeras, and SM werent much better in their Razorbacks.

 Grimmor wrote:

 Powerfisting wrote:

 Grimmor wrote:
An interesting concept, though i feel it needs playtesting. I've got no problem with vehicles be as durable as they where in 4th, but I never want to see 5th ed vehicles again.

This is off topic, but I barely played any of 5th ed. How crazy were vehicles and why were they so durable?

I dont remember why exactly, but glancing things to death was damn near impossible. Ill just say that Imp Guard where horrifying with hordes of Chimeras, and SM werent much better in their Razorbacks.

It wasn't just that vehicles were more durable (no hull points, no real way of accumulating damage that would increase the chances of being wrecked) but also some unfortunate interactions with the line of sight and disembarkation rules that made for extremely un-fun gameplay.

I found 5ths rules for vehicles fair better than todays. It's far to easy to glance a tank to death these days.

HoundsofDemos wrote:
I found 5ths rules for vehicles fair better than todays. It's far to easy to glance a tank to death these days.

Right, glancing a MBT to death with three hits does feel cheap but, equally, 5th edition, where glances straight up could not kill a vehicle, is also not ideal.

So, please try out my suggested change above and let me know how it plays?

Based on a question raised in YMDC, have added "ignores cover" rule to "effects on passengers" because I have no idea how this was missed in the base rules.