I have a 6.5 KW version of that Onan and it all depends on how the fuel line is piped in. My genset runs off one side.
Some of the higher end 5th wheels have installed larger dedicated tanks in the frames just behind the axles. I am doubtful that the Montana frames would take that stress. One could check with Lippert directly however Keystone would mor than likely nullify all or part of your warranty. If you are out of warranty and Lippert says it will support the weight I would consider it.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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