I think you will overload your mount. A 8" newt is right on the limit for a eq5 and putting a 5" newt with it would give you only frustration I think...
I mainly use a 70mm f/7 saxon refractor with 3x barlow and eyepiece..
You can get 70mm f/10 skywatcher scope rather cheap and they make excellent guidescopes, and they are light!!
Cheers Gary
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