Best options to order on a TT

[FlyingAroundRV]

G'Day all:

We are heading to the US next year to purchase a TT and a pickup truck to pull it. Our initial intentions are to buy:
A Keystone Outback 272UFL and
A Ford F-150 XLT (probably 2012-2014 year)
From what I've read, I'm thinking of having these changes and additions installed
-50 Amp service
-Wired for a second A/C
-Solar prep
-Better tires (eg Maxxis or similar)
-Linoleum throughout vs carpet in the bedroom and under the dinette

So, what are we missing here? What other changes/additions do you think would be good to consider adding to the trailer from new?

We plan to travel quite widely through the US and so the climate we will be exposed to will vary. We plan to travel mostly during the summer months, but may do some winter touring. We will definitely not be touring in the north (where they salt the roads) during winter.

Your thoughts are most welcome.