Your experience is not normal. And you don’t say which axle has tire separations or both.
Nor do you say what size of tire/rim.
But if you’re on 215-85-16s or similar pizza cutters, you are far closer to being at max tire capacity on the front axle than you are on the rear axle, even with the camper loaded. And if it’s a diesel and/or you have any additional weight on the front axle you might even be overloaded on the front tires
If your original tires on the truck new were the commercial TAs I’d blame the cheap junk sub par tires that mfgs put on many/most vehicles.
Second set, you are not specific what model of Goodyear tire, as there are many wrangler models, but were they LR E and a quality model? IE no not cheap OE/Wallyworld looking models.
Personally I’d not run off brand tires like Westlake either.
No it’s not normal or usual to have tires separate. Period.
It’s either weight, cheap tires or the worlds worst luck. Since it appears the tires are treated pretty well.