Nice truck, they can easily take the weight and they don't mind getting wet at all but there are a number of known weak spots primarily the cooling system. Many have had head gaskets done only for them to fail again a few weeks later. There are some bad years, think it's 2002-2004, where this is worse. Also look out for heads / blocks developing cracks, crankshaft pulleys coming loose and chewing up the woodruff key or falling off and wrecking the crankshaft. Main problem is they are a cool truck with typically low gearing and driven by trendy, lifestyle people at 90mph down the motorway which seems to kill them fairly rapidly because it's not what they're designed for.
Space in a double cab tub isn't much over 5 feet in length which doesn't leave much space for pump and battery. You can get a Club Cab which has two doors and four seats + a little over 6 feet in the tub which is more useful but they are few and far between - That's why I settled on the equivalent Ford Ranger.