OK< I looked at this, before posting, and it's long, and probably more than you wanted but perhaps someone who is also thinking about a rig can benefit from something herein.
There are so many variables. It is hard to select what you need without certain information.
for instance it is important that you know the difference between what the trailer weighs bone dry and empty, and what it will weigh loaded up with all the crap she takes and all your hunting gear, and a full load of water, propane, and all the etc.
If you use it every single weekend plus two weeks hunting a couple of times a year, there is a basic load of stuff in it that never changes, and starts off your weight calculation. Blocks and chocks are heavy, so I use plastic leggo-looking things for blocks, and plastic chocks. Far lighter. Propane: two 10 galling tanks are heavier that two 5 gallion tanks, and that is right on your tongue, so that increases your hitch weight. Also if you use one battery vs 2. I use two 6 volt batteries, so that's another bunch of weight (about 65 lbs each, more if you REALLY get big ones).
Now you have all your basic stuff in the kitchen and outdoor cookery: Pots and pans, dishes and utensils, lighters, knives, the barbecue, coleman lanterns, ropes, tarps, extra table or two, then lawn chairs for everyone, a basic tool box then of course the bathroom has to have TP, Paper towels, towels, soap, shampoo, and all that girly stuff she can't do without. Then of course theres, the basic load of weapons, toys to keep the kids entertained, and other equipment.
After you have the trailer loaded, take it to a scales and get it weighed. On the plate where it tells you your weights it will tell you how much cargo you can carry. This cargo number includes water and propane, and all that crap I listed and anything else someone throws in.
It is eye opening to see how little the allowable cargo weight is compared to what you actually throw into a pile to load up. Calls for some serious culling.
Putting some of that on the pickup helps, but that is still all being hauled. Having a capacity of say, 11,500 lbs doesn't mean you can simply load up a full 11,500 pound on your truck/trailer and still be safe. That number is about how much you can put on it and still actually move. Stopping is the biggest issue, not to mention lesser concerns like wear and tear on the trans, engine, clutch, brakes, suspension, tires, etc. Oh, I almost forgot, add another 100 pounds of so for the weight equalizer hitch and anti-sway bar.
The basic rule is that you will have far more weight on the rig than you planned, not enough rig to pull it (no matter what you thought when you bought it) and way worse gas mileage/power hooked up and hauling that you ever thought.
I have owned 5 RV's all bumper pull, some 34 feet long some 18 ft, and just picked up a 26 foot front bedroom, rear kitchen rig that is light, and has a good floor-plan. We NEVER travel with water in the tank, unless it is a short "fill up in last town, pull up to dry camp" sort of thing.
IN the forest we run a hose for the gray water into the woods, and drop into town to dump the black water tank. Hooked up at an RV park, we leave the grey water open, and the black closed until 3/4 full, then drain the black (close the grey first) and flush throughly each time. The black tank is a digester, so keep it closed and allow it to fill so it can work, and it won't get plugged or other problems. We never drop anything down but human waste, NO paper or wipes EVER. On that point, however, all men in camp go outside, and any women who are so inclined. That extends the time the tanks can go. We have hand washing stations outside as well, and an outside shower with a shower tent that runs off of the trailer pump, and hot water heater. In dry camp we run water from a nearby spring in a clean ice chest and pump it into the fresh ager tank about twice a week. WE are far more stringent if we don't have water nearby. We carry 3 or 4 empty 5 gallon cans to fill and haul back to the trailer. Works great. Just have to keep an eye on the black water tank level. You can use a "blue boy" to haul off 25 or 35 gallons of black water if you feel like you want to handle lifting that into the truck. That will allow you to extend the time you can stay in one spot without emptying the black water tank. You can dump the blue boy in the toilet at a nearby Forest Service campground. That saves going al the way to "town".
If you are handy install your own solar panels to charge your batteries, and keep everything turned off. Use minimal lights, and turn them off after use. Newer RV's have LED's so power drain is minimal, but the CO monitor, and Fridge (circuit board) both draw all the time, so a trickle charge is needed. Keep the pump turned off unless needed. I have three panels that keep the batteries pretty hot, and only have to charge with the generator about once a week or run if we have a social event.
Each manufacturer has a "lightweight" line, but I won't haul anything sold with anything less than a 3/4 ton.
Look for a floor plan that you want, but also look for adequate outside storage. and that slide you mentioned, there are 12 inch lids (how far is slides out) 2 foot slides, and 3 foot slides. Also there are 6 ft slides, 8 ft slides, super slides (12 foot) (length). all combos of each. A slide increases the weight!! run the slide in and out in the showroom. See if you can get to the kitchen and bathroom and seating with the slide IN. This is for convenience on the road. You don't want to have to run it in and out every time you stop. Look for upgraded lock sets on the door panels, and entry door.
If you REALLY want bedroom space, consider a Toy Hauler, and convert the garage into the master. I have seen several in RV parks, with two Harleys inside for travel, and a kin sized bed up against the ceiling until the bikes were unloaded, then dropped down, huge TV, kegerator, surround sound, etc, screened porch when the ramp door was dropped to level, with fold down legs. All on a bumper pull.
I know a guy here in town who uses a really old 16 footer. He surrounded it with bales, to insulate the lower part, and uses the furnace all the time. to get through winter. He goes into the house to shower, and cook, so its more of a bachelor bedroom. No wife no kids. No thanks.
Good luck.
