Unfortunately Triumph only played lip service to the passengers needs on the new Rocket despite offing a GT version. I changed my Thunderbird LT for the R3 GT and my wife hated the pillion setup. It has taken a lot of work to get the bike to the point that she finds it comfortable.
Changes are:
Add 2 inches to the height and width of the pillion seat ( I did this myself but had an upholsterer make a new cover)
Fit larger sissy pad.
Fit full mudguard
Fit lower and slightly forward pillion pegs (and she is only 5ft!)
Fit larger bags (the wife needs a lot more stuff than I do!)
To be honest it was a lot of work and quite some expense and I wouldn't have bothered except that I had already swapped the bikes. Before anyone says I have ruined the bike all mods (except the thicker wider seat) are reversible.
My advice is to keep the old R111 for 2 up and touring and use the R3 as a solo machine.