Cleve looped the rope around his waist one time before handing the rest of the rope to James and Dan. Cleve and Frank were about the same height and same size, and factoring in the fact that Dan, James, and the dinosaurs would soon be all clinging onto the rope, Frank should be alright... as long as the rope doesn't snap.
"Alright, be careful now," Cleve advised Frank, "if you feel any danger, pull the rope twice. Also..." Cleve took his Colt M1911 out of his holster and gave it to Cleve. "I have no use for this," Cleve continued, looking at the gun, "so if you run out of ammo, use it as a backup. Bring back anything that might be helpful. Good luck!"