How much squat can I expect?

For what its worth, last fall my wife and I had precisely this problem when getting a rig for our Jayco HT% 24.5 CKTS 5th wheel--which is the lightest and smallest fifth wheel Jayco made in 2018 and is advertised as half-ton towable. We initially went with an F150 we'd been promised by both dealers (truck and RV) would be adequate (newbie mistake as we were over on payload and rear axle weights). We then looked at a few new 4x4 3/4 ton trucks. All were way too high. We would have had to pay big money to get the trailer lifted as the axles were already flipped. We found an article on one of the RV forums that said that 2WD F250s averaged 3" lower than the 4x4 F250 (which was way too high). We thought about our realistic needs and, given how we camp, didn't really need 4WD (we will pay for a tow if we ever get stuck) and went with the 2WD. Our 2WD has an electronic locking rear axle and, with all-terrain tires on the back, we figure we will be able to get through most rough spots. We have been very happy with it so far and I think you get a better overall ride with the 2WD. You will find, if you ask on the forum, that 2WD vs. 4WD is like arguing religion - strong opinions on either side. However, w/ 2WD The trailer sits perfectly even with only 1-2" of a squat. Just a thought for you if you don't absolutely need 4x4.