I once towed a 39" 10K loaded TT wirth a diesel and V-10 Excusion. It was a great combo. However
Excursions are no longer made. 2500 Suburban have also been watered down and no longer rated to tow a heavy trailer.
There are Excursions and capable 2500 burbs available on the used market but as time goes on those trucks are getting older. Finding a decent used 3/4 ton SUV is hit or miss.
In today's market I would look closely at 3/4 ton passenger vans.
While I prefer towing a large trailer with a diesel. Diesel vans are hard to find.
I would focus on E350 and Chevy 2500 vans even if I had to compromise and settle for a gas engine.
19'Duramax w/hips, 2022 Alliance Paradigm 390MP >BD3,r,22" Blackstone
r,RV760 w/BC20,Glow Steps, Enduraplas25,Pedego
BakFlip,RVLock,Prog.50A surge ,Hughes autoformer
Porta Bote 8.0 Nissan, Sailun S637