Turtle,on that fireman's carry I think you'd do a lot better using a sandbag. You can make one using an army/navy bag. It'd be more realistic as it would be similar to the action of carrying a human, irregularly shaped with the weight moving around as you carry it. This technique is common in strongman training because their feats require lifting and moving unusual objects. Another way you could do it would be to use a beer keg half-filled with water. As the water sloshes around you have to build balance and strength in your stabilizing muscle while you are carrying the object forward.
Same with the hose. Go to the hardware store and get some chains. Same principle.
I know some gyms are fussy about this stuff but they might cut you a break if you tell them you're training to be a fireman. You can always work outside on 'Cardio' days.
There's a short article I like over at elitefts.com called Blue Collar Strongman Training. It's a no b.s. approach to this type of training w/o using alot of specialized equipment. You may not want to use the entire program but it'll give you some ideas you can use. Here's the link:
http://www.elitefts.com/documents/blue_collar.htm