30 (two rows of 15 if the fork entry is on the 48 inch side and two 48 inch pallets can fit next to each other in the trailer).or26 (two rows of 13 if the fork entry is on the 40 inch side).The above assumes one layer of pallets (no stacking).
It depends how thick the pallets are.
16
Depends upon what materials or products are on those pallets. Whether they are cans of Spam or sides of beef will make a huge difference in how many will fit.
20
28
22
26 standard size pallets
Yes, If load the pallets sideways and double stack them you can fit 60 pallets on a 53' trailer
If they are 4' x 4' then you can fit 2 rows of 12, or 24 pallets. If you can stack the freight 2 high, you can get 48 pallets in there.
20
24
22 is the minimum count.
26-30 single
Standard pallets are 4 feet so single file would be 12. If you put them side by side which is common 24.
26 skids (standard 40x48) side by side total. if you are willing to load pallet side way you can load up to 30 pallets. Assuming all pallets are not stackable.
Assuming you mean a 48 ft. trailer with at least 96 inches of deck width, and you're using standard 40"x48" pallets, you could fit two across and 14 long for a total of 28 single stacked pallets.