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My Scope with camera come to 4.2 kgs
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Cool!
A mount that is officially labelled with a load capacity of - ideally - 8kg, but possibly also a little less than 8, can carry your setup for astrophotography.
If the tube is nicely short it can be balanced very easily. If it's a longish tube then not so easily. Good balance is of course necessary for good tracking results.
But yeah, an EQ5, motorized: go for it
With Goto: even better!!
I wouldn't bother with guiding, though.
It complicates things enormously, adding a computer and software and more cables into the equation - and thus also makes your setup less portable.
And: if you take 20 exposures of 30 seconds each, unguided, you collect the same-ish amount of light that you get in a single guided exposure of 10 minutes.
If you calculate with 30 seconds exposures you can even consider a motorized Alt-Az-mount. The Goto-Versions are also cheaper than the EQ Gotos and they're easier to setup, too.
The game of astrophotography is changing.
Where it was the mount that was the most important and expensive thing in imaging,
nowadays, this is more and more becoming the imaging camera.
You start off with your DSLR, a 150mm scope and a so-so mount - and eventually upgrade the camera to a CMOS.
While still working with your so-so mount and 150mm scope. I'm sure of that.