How big is the bed of the truck? I have a full size truck with 6.5' bed and hard plastic bedliner. I just throw a full sized air mattress on the floor of the bed and the plastic floor combined with the air in the mattress provide pretty good insulation and a very comfortable night's sleep - it's been down to about 45-50 deg at night and I didn't even need to sleep inside the sleeping bag, just unzipped as a heavy comforter. My camper shell is also lined on the inside so may make a difference in heat retention/condensation as I've had no issue with either. With a smaller truck bed that may not work as length wise it just fits at 6.5' - I think it may improve the heat insulation as it's a tight fit all the way around so doesn't let much cold from the bottom up. If you don't have a full sized truck, a twin sized mattress might work better width-wise. It's nice as I don't have to carry anything other than the air mattress, sleeping bag and a stuff-sack with my clothes (that I can use as a pillow) which take up almost no room under the back seats in the pickup (extended cab). I usually bring a separate pillow, but if space were really tight I wouldn't really need to.
Platform would be good if you needed dedicated space for carrying things that you didn't want to have to take out of the back of the truck every night. Otherwise I don't see the point, you just lose headroom.
For lighting a have an led flashlight that also can be used as a lantern if you pull the end out and it hangs from a hanger built into the top of the shell so no need to wire anything.
I should add, all I do in the back is sleep, so not much need for shelves or much lighting other than what I need to get myself into bed. If you plan to spend time in there other than sleeping I could see it.
Platform would be good if you needed dedicated space for carrying things that you didn't want to have to take out of the back of the truck every night. Otherwise I don't see the point, you just lose headroom.
For lighting a have an led flashlight that also can be used as a lantern if you pull the end out and it hangs from a hanger built into the top of the shell so no need to wire anything.
I should add, all I do in the back is sleep, so not much need for shelves or much lighting other than what I need to get myself into bed. If you plan to spend time in there other than sleeping I could see it.
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