My first thought was "that's my rig!!". But I'm clear across the country from it I know it's not.
I'll jump in and guess also as I can armchair investigate with the best of them.
That is a mid to late 90's Suburban or Tahoe, and it's most likely a Tahoe. I recognize the rear end as it looks just like mine, and you can make out the vertical line of barn door windows on the vehicle.
That era Suburban has a long overhang between the rear tires and the bumper. In the picture the tires appear to be really close to the rear bumper which would make it a Tahoe. So I'm claiming it as a Yukon/Tahoe.
I'll put the trailer as a 24 footer because the space between the rear axle and bumper is filled almost completely by what look to be 35 - 40 gallon tanks. My 27 footer is laid out the same underneath and definitely has a few more feet than that between the rear tank and bumper.