My 760000t rocket crashes at Launch Pad!

[spec111]

Why? Version 1.2.1. Heavy modded.

(Smaller configuration works fine, but when i added 70000t second stage rocket starts crashing.)

Edited February 9, 2017 by spec111

[George van Doorn]

Are you sure about this number? I think my biggest complete rocket was about 15 000 t and you probably need the Hangar Extender beyond that. Not to mention how slow it will run in the atmosphere..

Regardless, have you see that the rockets are sometimes placed in the air and falling if not attached to clamps? I'm not saying put clamps on such a monster. For me, aligning the base of the rocket with the floor of the VAB worked to alleviate this.

 

Later edit: A'ight, so I checked some of my biggest, it's 20 000t and there's no way to extend it sideways, just to add things on top of some side stages. Your number must be off if you don't use the Hangar Extender mod. Nevertheless, my proposed solution still stands.

Edited February 9, 2017 by George van Doorn
Clarifications

[spec111]

Yes, im pretty sure. =) KW Rocketry + SpaceY + other construction mods. So i have 4x20m huge fuel tanks + 11x20m SRB solid busters only at first stage. =)

Yes, im using Hangar extender. 

Oops. I tried to align it to ground and my rocket starts doubling. Yes, there is TWO rockets on launch pad! One is freezing and one is crashing. =)