only one little function added to this beautiful model:
brake for stability! in reality, a self propelled howitzer should come to a stop and brake firmly to operate and fire a bullet, while in this model, I found it will always slide forward or backward when I aim at something, it's annoying me, so, I added the brake stick under the body, so, pull the left stick for brake as normal, press button 8 to lock the stick on the brake status, and then release the left stick, now, even you push the right stick forward, the vehicle will not move! you can aim more easily, one more thing, don't forget to press 8 again to retract the brake stick before move on!
one little function more, to improve the ability to climb a slop, I added three blasto J50 engines inside the body and lots of air inlet, so that, it can get about 90 mph at the end of jump zone in sky park city, more than the 49 mph of the orignal howitzer, just increase your throttle by push the left stick when you move with right stick forward!
One more thing, I found the aiming in button 1 activated mode is a little annoying too, there should be one articulatory node more vividly be added, I think, something like naval gun this https://www.simpleplanes.com/a/Q4jwiQ/Naval-Gun-v1-0, @SpiritusRaptor