Animation of 1960s Boeing's 4 Million lbs Payload Rocket (LMLV)

[FutureSpaceTourist]

This is a fab animation:

Boeing's 4 Million lbs Payload Rocket (LMLV) Large Multipurpose Launch Vehicle Concept
10 Feb 2020

A 1968 NASA-sponsored study of a large multipurpose launch concept

A potential application of this launch vehicle concept is for launching future manned interplanetary, extended lunar, and large space station payloads. For many missions, the payload versatility of the launch vehicle system could be used to orbit the total payload requirements in a single launch, obviating the need for orbital assembly. Previous mission analysis information indicated that a payload capability from one to four million pounds to low earth orbit would adequately cover the range of these mission requirements

The concept is a "building-block'' vehicle system that features a main stage capable of single- stage-to-orbit operation and add-on stages, either boost assist or upper stages, that afford a broad range of payload capability.

Ten 372-inch solid motors would have resulted in a payload up to 4.2 million pounds

[Nomadd]

 Those boosters are about the size of a SpaceX SH.
 I'm not sure if I'd want to be a mile and a half away from 420 Raptors all firing at once. They'd be breaking windows in Houston.