I've been backing boats since age 15 now 47 also backed my pop-up for years with that short wheel base. Fished local tournaments often had to back the boat a 1/4 mile down the center of the road becau...
In my opinion, backing up a longer travel trailer is far easier than a small boat trailer so I don't think you'll have any trouble.
That said, you do need to get comfortable with your mirrors. I do turn around and look sometimes as it helps me better judge distances but you need to be able to primarily use the mirrors (especially the passenger side) to avoid taking out trees, posts, etc. that may not be visible otherwise.