That Primewell would be my last choice. I'm sure they're safe in terms of they hold air and roll, but I have a pair of these on my trailer and there is ZERO tread siping on these tires. The tread blocks are extremely stiff, and there's no siping for water evacuation. And to top it off, they're technically directional tires, so he won't be able to keep them rotated as he should, at least not without dismounting them from the wheels. There's really no reason in my opinion to buy these.
Two good options for the money:
The Nexen Rodian HT at Walmart is $87 each, plus installation. He'll be looking at closer to $400 installed rather than $300, but these are FAR more appropriate for his Jeep. I'd even buy the $71 Goodyear Viva 2 before I bought the Primewells.
Next, looking at Firestonecompleteautocare.com, the Firestone Destination LE2 is only $12/tire more than the Primewell in this size. For 48 bucks, there is absolutely ZERO reason to buy these Primewells. If he can get the deal he's getting on the Primewells, he should check into the Destination LE2.
Third, which is really an extension of the one above, look in the discounts subforum; Indydriver posted a friends and family coupon good at any Firestone dealer; you can buy the tires at $1 over cost, which is a significant savings. The $104 Destination LE2s could probably be had for closer to $60-70 each. The catch? It's only January 3 through January 30. If he can wait until the 3rd, he'll get some good tires for not a lotta dough.