Nice camper you are looking at! We love bunkhouse campers and we had a Salem Sport SP295 prior to our Toyhauler we tow now. The TH is more or less a bunkhouse with how it is setup for us.
Those weights are fine for the NVP. My TH is around 7500-ish pounds when we are loaded for a big trip and the NV pulls it well even in the mountains of NC and TN. Do I wish it had more power? Always! Does it maintain speed on the inclines? It does, but it does it in 3rd gear with the RPM's wound up which is normal for a newer gas motor like ours. It may sound alarming but there really is not much harm being done at all. The other nice things about the NV is the monster sized transmission and oil cooler sitting right behind the grill. Even in 100* heat nothing gets too hot when towing.
Towing through streets is just fine, if you are not used to towing something that long just make very wide right turns and make some practice runs on empty streets. Be Very aware of the tail end of the camper swinging wide. The axles are near mid point to keep tongue weight down but that means you have 10 plus feet of camper hanging out the back pivoting when making tight turns like in gas stations or through a campground. You can clip things with it when you think you had plenty of room. I did it with our first long camper even after towing it over a year... Not fun!
My biggest caution for you is to make sure you get a GOOD WD hitch. Not the cheap ones they toss in for free with the purchase of the camper. Those are usually the EZ or Curt round bar hitches with a single friction bar. At that length they require two friction bars, one per side. Do they work? Yes! Are they a pain? Yes! You have two bars to hook up then you have two friction plates to hook up every time. They are also LOUD when turning at slow speeds (to be fair, so are other higher end models like an Equalizer). With all the newer hitches out there you would be better served by upgrading a little. Check out review sites or places like RV.net for suggestions. Everybody has a favorite. I happen to prefer a Blue-Ox Swaypro for my setup. Easy, clean and quiet and it just works well. Downside is that it is very heavy with a huge one piece head that is around 70 pounds to carry around. There are lots of new hitches out there though.
Second caution - do Not trust the dealer to setup any WDH correctly. They want you in and out fast. They will go by some generic setting that will get you close and call it a day. When you do pick a hitch, read up on it and then read up on proper WDH installation so you can either check it at home if you have the tools are watch over them to make sure it is right before leaving the dealer. You would be surprised how one extra link on the bar chains or a small angle change on the head will affect the actual weight and handling.
Lastly - Check your trailer tires religiously. Most likely they will be cheap generic tires and they are well known to literally blow up going down the highway. We just witnessed one blow up 3 days ago on a fifth wheel. We were next to him on the highway and it sounded like a shotgun went off. Looked over and his tire was in shreds. I've had it happen twice in many years of towing and it is not fun!! The only fix is to swap out the cheap tires for better ones. I did that immediately on my TH, I only had 50 miles on my brand new dealer tires and I swapped them out. It is not worth the headaches and risk. If you keep the originals on there, keep them inflated to max cold, keep them covered from the elements and do not go over 65 mph on the highway. Period. Some owners get several years out of OEM tires. Others get several weeks. It is a roulette spin to see if it happens.
Sorry for the novel... We love camping as a family and have been going for many years even before kids. I started in tents, got married and we had a pop-up, had kids and moved up in camper size as we had more kids (and dogs). You'll be fine and the NV will be fine, just take your time and read up.
2015 NVP SL - Silver, 20% tint, Bully Dog GT, AEM filter w/ snorkel mod, Topper Rack, Hankook AT-M tires. DRL delete, HID's
2015 XLR Hyperlite 27HFS Toy Hauler
Blue Ox Sway Pro
Me, wife, 3 kids and 2 big dogs!