I thought I'd jump in and let you know about our Hallmark experience.
We have been using slide in pop up campers for over 30 years and are now on our 5th. Our newest is a 2011Hallmark Cuchara that we picked up locally earlier this year. After having basic, no frills campers all those years upgrading to the Cuchara was a nice change. It's mounted on our 2018 F-350 XL gasser 4x4 extra cab, long bed.
We have been very pleased with the quality, fit and finish, and appearance of this camper. Other than a torn screen on the popup portion over the sink and a small cut in the screen door screen this thing was very well cared for. It came pretty much decked out, with oven, wet bath, air conditioning, ladder on the back and two brand new 6 volt AGM batteries. It also had an aluminum box on the back mounted to the camper bumper for a generator (generator not included) but since we don't need or want a generator we use it for outside storage. It also had the shovel/axe mounted on the back with the locking bracket. I saw no reason to have an axe so I ditched that and was able to fit a halligan tool next to the shovel which seemed more useful to me.
The camper sat a little too low in the truck bed for my taste on our new Ford so I added a sheet of 3/4" treated plywood on the bottom to kick it up just a notch. Cleared the bedrails of the truck better. I can also drop the spare tire no problem even with the camper's extra overhang.
It came with the East West oriented bed, which we prefer.
Once in a while we tow an old 1976 Datsun truck bed trailer that we carry our canoe on. I purchased a 48 inch long hitch box extension from etrailer.com for under $300.00. It fits in the stock Ford hitch. Works great.
We had a set of Torklift scissor steps from our other popup rig and use it on this camper. I store it just inside the door of the camper and it attaches to the little "porch" on the camper bumper. We also have the Torklift handrails that are easy to set up at camp. I'll be 70 next spring so having that extra support getting in and out is nice.
Immediately after we bought it we had to decide if we were willing to gamble on taking it or our tried and true small travel trailer on a cross-country trip to Washington, D.C. We hadn't even given the Cuchara a one night shake down trip to Anza Borrego or even tried it out in the driveway, other than making sure the reefer (3-way) and hot water heater (6 gallon) fired up okay. We decided to go for it and take the Cuchara. Everything worked out fine. Six thousand miles and not a hiccup the entire trip. Possibly due to mid-west headwinds the camper did move back slightly in the bed, even with the rubber mat under it, so I added two turnbuckles at the front. I attach one end of the turnbuckle to the factory in-bed tie down brackets down low at the front of the truck bed and the other end to a bracket screwed to that sheet of plywood. I can install and adjust them pretty easy thru the access ports in the camper when I load the Cuchara. That keeps it from walking back in the bed, especially on rough roads.
We are very pleased with the Hallmark. Heading out to Borrego in an hour for an over the Christmas campout. Maybe when we get back I'll see if I can figure out how to post a photo of it.
Good luck with your research.