Hello,
Remember to NOT overload the scooter.
It weighs about 360 lbs to begin with, but I cannot find a max load that it should carry.
The max load is probably about 2/3 of the scooter's weight, which would be 240lbs (2/3 of 360).
Now subtract the weight of the top case that you added.
Then subtract your weight including your riding gear.
That probably does not leave a lot of weight for additional packing.
Once you fill the area under the seat and the top case, I expect you will be close to exceeding the max load.
Remember to pack the heavy stuff under the seat to keep the center of gravity low.
Also, check the max load for the top case... it is probably about 20 lbs.
That adds up to saying that you need to select what you carry and take care where you pack it.
And then have a safe & fun trip.
Remember that Goodwill & Salvation Army stores as well as WalMart are re-supply centers when on a 2-wheel trip
scoot safely,