Is it bad to run my Jeep at a constant 3000 RPM?

I drive an 03 Jeep Wrangler TJ five spd with 31" by 12.5" tires and stock gearing, and I go over a mountain twice every day to get to work and back home.
A sign on the road mountain tells me that it has a 8% grade. I asume that that's the steepest it gets.
I travel up one side in third gear at 55mph at about 3000rpm for most likely a little over five minutes, then coming back the same thing but for nearly ten minutes.
Is this bad?
I do it because fourth can not take it and it slows going up.
I put it in fifth at the top all the way down.

3000 is good. If you have to use lots of gas at low rpm, like trying to use fourth or fifth up the hill, the engine will attempt to produce lots of torque at a low RPM. This puts lots of pressure on your rod bearings while your oil pump is turning gradually and producing minimal pressure.

It is better to use a gear with a reasonably higher RPM where there will be less strain on the bearings and more oil pressure to keep things lubricated.

Nah you're ok you're doing the right thing that's what it takes to do the job have a good one hope this helps.

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