hello austin,
one of the reasons i purchased my titan was to someday haul a slide in camper. i currently tow a 22ft camper with it with no problems. but like you some of the places i go it is almost impossible to tow a trailer in. i know that this is not the best truck for a slide in, but i didn't want to go back to a ford chevy or dodge.
the owners manual specifically states not to haul a slide in with a crew cab, but is ok with a king cab.
now for some measurements,
bed length is 781/2" wheel well heights is 9" distance between wheel wells is 50".
the owners manual has the following vehicle load weight capacities-
king cab 2wd standard bed-xe1641 lbs se1590lbs
king cab 2wd high utility bed-se-1499lbs le-1387lbs
king cab 4wd standard bed- xe1508 se-1458
king cab 4wd high utility bed se-1367 le-1255
i hope this helps, i think the only limiting factor would be the suspension, and it would'nt be all that hard to beef that up. the truck certainly has enough power to haul that much weight.
happy camping
