There should be, on your driver's door pillar, a tag with the info you need. You're looking for the GAWL (Gross Allowable Weight Limit), and the allowable weight on each axle. You will alos need to weigh the truck full up, with you in it. Subtract this weight from the GAWL. This will tell you how much the truck can carry in cargo, but the tile would be over the rear axle, so you'll need to temper the gross cargo amount to allow for that. How? The best way (and the most time consuming) is to weigh the truck's rear wheels; this will tell you just how much tile you can load in the back end.
Why do all this? Because getting it wrong can ruin more than your whole day. :-)
Or, make a bunch of trips. Or find a friend with a pickup. Or have it delivered.