For anyone who cares, I did a comparison on the size of a 12' box with slide PUP, a 2318G compared to my 26BH Jayco Jay Flight that measures 29'1" bumper to hitch,right around 26' box length, and 8' wide.
The 2318G has a open length of ~24' and a box width of 7' and the slide is ~2' wider, so a complete width of about ~9' at the slide.
Here's the pic
2019 Ford F150
Race Red XLT Sport, CC, 4WD, 145" WB, 3.5L Ecoboost, 10 speed, 3.55 Locking Axle, 1830# Payload, 12,700# Tow Rating, pulling a 2020 Rockwood Premier 2716G Pop Up
, with a 14' box. Previously had 2012 Jayco Jay Flight 26BH
and 2008 Jayco Jay Flight 19BH
Travel Trailers. Also previously had 2007 Starcraft 2406 Pop Up with 12' box
and bathroom, Previously had 2005 Rockwood 2290 Pop Up with 12' box
and porta potty cabinet. Trucks and Trailers.