Normally companies learn by their mistakes - this abomination alongside the one quoted earlier appear to be slightly different abominations of each other (not sure which came first, bot either way they clearly didn't learn!)
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The body-builder had learned. The Dennis Dominator is a chassis designed for double-deck applications, with a relatively short frame-length and rear overhang, at the end of which suspended transversely is the weight of the engine, plus gear-box . . . like the Daimler Fleetline. When Daimler introduced the single-deck version of the Fleetline in the late '60s it stretched the chassis frame and the rear overhang and body-builders designed bodies that incorporated the engine inside the passenger saloon with the rear bench seat perched on top. The consequences of the weight of the engine and gear-box flexing around at the end of the rear overhang caused tremendous strain on the rear half of the body leading to "body-sag" - a batch of Willowbrook bodied Fleetlines diverted from Maidstone & District the Northern group literally cracked-open. Birmingham received some Fleetline single deckers bodied by Marshall which retained the rear bustle, and Great Yarmouth received some Leyland Atlantean single deckers bodies similarly - retaining the rear bulkhead in front of the engine clearly improved structural stability as these vehicles were much more trouble-free in service. What we have is a couple of small municipal operators who both wanted a straightforward, tried-and-trusted, chassis for a single deck application; Dennis probably had space capacity, and was able to offer a good price to get the work; and Marshall - remembering the problems of two-decades previously - stuck the engine outside the body . . . not pretty, but structurally-sound at least.