Most rear bumpers are thin metal and are rated 100 lbs. max. My spare and spare holder are probably 55 to 65 total and I have not had problems with some very rough roads. In fact, parts of the cabinets split or shifted inside and every door popped open.
I would not add more weight then the factory already loaded with this spare without reinforcing the bumper or mount. A local welding company can easily reinforce the bumper spare mount if you are worried.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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