Tires, fluids, plugs and some Seafoam in gas. Regular gas is fine. Fuel filter(it's in a bad place... Move to right behind tank, under seat.)
Fuel pump points. Or another pump. The points go bad with time and mileage. If yours look good then 👌.
Pack for roadside repairs... Your know the stuff.
Buy a hand air pump unless you already have one for your HD.
Set air in shocks to about 5lbs up front and 25 in rear.
Then ride it. Find the compromise between a nice ride with no shock bottoming out in rear.
Yes, she's a heavy scoot.... But low end handling is good, high speed stability is solid.... You will just need to sort her out.
On the road, I run 38lbs in front, 40 in rear. That seemed the best for my load....
BUT, remember you aren't on the Dyna...no short shifting...let her rev. As you become used to the bike, let her rev more and enjoy. Under 70, stay in 4th gear.... Won't hurt a thing. Mpgs should be around 36 to 38. Much less indicates running to low rpm(bogging down), carbs out of sync or vacuum leak, Dirty carbs. Run more Seafoam!
Regarding cross country.... I've made a couple of serious cross country rides and have to say, the RSV was by far the most comfortable. Getting off on the 2 lanes and cruising at 65 was a pleasure.
Wishing you a great ride!