RWR is a hard game, and thats what makes it fun. I want to add to the games difficulty with the introduction of Self Propelled Artillery (SPG).
Purpose: To add to the lack of variety of ways where you can get killed unexpectedly. To make it harder for base capping. To give players a run for their money by having a more consistent way for enemies to rain down on you with artillery.
Pros:
-can be used without comms
-impressive range
-massive kill radius
-great damage potential, can oneshot any tanks and infantry within its blast
-excellent support potential
cons:
-speed of a bus or less
-very slow pivot
-Very slow traverse
-weak
-have a 100m deadzone
-very slow reload, the average amount of kills you can get over time may not be as good as just using an assault rifle
-very inaccurate
Ways to implement this:
a. only the enemy faction will spawn with it
b. doors will lock when occupied, making it hard to capture
These stats are just my proposed stats, devs can change them however they see fit.
Brownpants
2S19 Msta

Health: 1800
Speed: 10% faster than bus
Pivot: 3 degs/s
Turret Rotation: 3 degs/s
Accuracy Factor: .4
Damage: 2000
Blast Radius: 12m
Deadzone: 100m
Range: 100-200m
Reload: 36s
Greycollars
Panzerhaubitze 2000

Health: 1650
Speed: 15% faster than bus
Pivot: 3 degs/s
Turret Rotation: 5 degs/s
Accuracy Factor: .45
Damage: 2000
Blast Radius: 10m
Deadzone: 100m
Range: 100-200m
Reload: 32s
Greenbelts
M109 Howitzer

Health: 1700
Speed: 12.5% faster than bus
Pivot: 3 degs/s
Turret Rotation: 4 degs/s
Accuracy Factor: .425
Damage: 2000
Blast Radius: 11m
Deadzone: 100m
Range: 100-200m
Reload: 34s
Below is my list of ideal map candidates since the progression in these maps are rather linear.
Proposed ideal map candidates:
Map2, Map4, and Map12
In Map 2, both sides will be able to spawn one spg
In Map 4, only the enemy will spawn with one spg
In Map 12, the enemy will spawn with the spg within the barricades at the beginning of match will already be ready to engage.
AI behavior: AI will fire into the general area where it detects a large cluster of troops.
Difficulties to kill it: all spgs will have a full rotating rooftop hmg for close quarters defense. About 10 AI bots will constantly guard the vehicle to make it more difficult to kill.