that is the question...
10 trips a year... OK, Suburban no longer comes with a diesel (wah), so you'd definitely be looking at an older one. I have a 'Burb gasser 2500 and it pretty much is my "daily driver" even though I also have a nice paid for older Lexus.
I've just gotten used to driving the big dawg.
BUT if I had it all to do over I'd probably go for the pickup truck (Silverado) rather than the Suburban. I'm vertically challenged - 5' 6" barely. I have to stand on a stool to check the oil in the engine, and crawling all over the back bed looking for stuff I've stored in the Burb is a pain in the tush. On further consideration I wish I had a great tonneau covered pickup truck so that I could access the stuff in the bed from three sides (even if I had to get out the stool to reach in).
The longer wheel base makes a huge difference and the 2500 engine comes in real handy on a mountain or when a blankin' dump truck comes hurtling past six inches from my mirrors.
I agree heartily, get a big honkin' used truck, and if you have to, trade the Jeep in on a used Honda or Toyota that's a true economy car! Jeeps are cool, but for the gas they use, they're "mostly show, little tow".
I understand "can't afford it" but you can't put yourself and your son at risk of a rollover either. Get something mechanically sound and UGLEEEEE and tow with it.
There aren't enough Airstreamers now, we can't afford to lose even one family of them!