Heater hose blew on the freeway

Been there, done that. I remember driving home about 1:00 in the morning 10 years ago. Blew the same hose as yours, coolant/steam everywhere. Luckily, I had a friend who lived about a 1/4 mile away that helped me fix it in the middle of the night.

That hose you have pictured looks pretty bloated, good thing you're replacing all the others.

New hoses, if the right size, should always be difficult i.e. require some effort to put on initially. If they go on too easily, they are the wrong diameter.