For the first 110" of wheelbase, this allows you 20' of trailer. For each additional 4" of wheelbase, this gets you 1' more of trailer. If you look at some of the physics and geometry inherent to travel trailers, you might see why length is an important factor to consider. From your vehicle specs:
145.7 - 110 = 35.7" / 4" = 8.9' or a total length of 29' of trailer length.
Keystone Passport GT 3401QD specs...
That means that you will have 10' more in length than recommended for the wheelbase of your tow vehicle. Travel trailers have very large sides that catch a lot of wind which means that yours will be a challenge in a significant crosswind. The Toyota has a maximum towing weight of 9800# and the trailer has a gross weight of 9670 so you will also be nearly at the maximum.