Life will be so much easier if your wife learns to back down the trailer; just practice!
My wife couldn't back a trailer either. We practiced during a quiet time at the boat ramp- wife would back the boat and I stood outside, by the truck coaching her.
She would back down, pull out then come back in like it was the first time launching and repeat the process. After about 10-15 practice runs, she was a pro.
Backing the trailer, IMO, is easier than loading the type of boat you have. As loading the boat you almost have to lick it and stick it...is that how the saying goes?! Almost have to come in a little hot as easier to keep the boat straight.
And when you are in the water, when in reverse the boat will only go back and to the right. So plan for limited backing maneuvering.
Before loading the boat dip the bunks completely in the water, helps longevity of life for the bunk pads.
Post some pics of your new boat!