Logistical issues in the film.
1. Leaving tiny children alone. How old are those 2 kids 8 and 5? You just leave them for weeks at a time? I could see leaving them with friends or relatives but leaving them alone? What ae the odds they would be there alive when you get back 6-7 weeks later? That was crazy. Is that worth it? "Kill a few chickens if you have to." WTF?
2. Riding horseback 450 miles. Kansas to Wyoming? As in almost all westerns you are shown the incredibly unrealistic image of one man on one horse. To begin such a trip would require at least 3 animals. 2 horses and a mule. A mule to carry much of your supplies and horses to alternate carrying you. To rely on one horse to carry everything is nuts. If the horse goes lame you are done for.