Personal experience on this wheelbase issue..
I had a 31.5 ft TT That I had a terrible experience pulling with a 2001 5.4 ford expedition. The SUV just felt pushed around and I had a true white knuckled experience. Wheelbase was 119 inches. Power was not a problem.
* full disclosure... The WD hitch was not set ideally on the expedition.
I then bought my 97 F150 5.4 SuperCab short bed... 139 inch wheelbase and immediately, the towing experience was so much better. If with the terribly set WD hitch.
I dialed in the WD and added sway control and the tow was great.
Tahoe Vs Suburban 1500? Overhang or not I will take the Suburban.
Suburban 2500 would be ideal and give up that squishy soft coil spring rear suspension on the Suburban 1500.
Thanks! Just my .02
Jeremiah