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Question: Can I fit a trundle underneath?  Can you assemble it without the ladder 1st?  (I want to use the bottom & a trundle now; bunk later)
Document: I was expecting a cheap-looking glossy finish.One last thought:  You can easily slide another 6&#34; mattress underneath the lower bunk to use as an emergency sleeping arrangement for a guest, or for your kids' occasional sleepover. If you look for bunk beds with a trundle, they can be quite expensive, so you can satisfy the same occasional need just by sliding a mattress underneath this unit...like a poor man's trundle bed...
This is exactly what I wanted. My daughter sleeps on the bottom and uses the top bunk for sleep overs. She has a small room and I was considering a bunk or a trundle. I like this bed alot. I was worried it wouldn't be sturdy enough since my daughter is 13 and this will stay till she leaves for college. It hold her and her friends without any shifting or leaning. It was also really easy to put together. We had it together in an hour.
This bed supports me well and is very sturdy. The building was easy, just listen to the instructions. Shipping was fast considering the big 100 pound box. All is well except the little legs supporting everything, I suggest you put this bunk bed against a corner and use a store pool noodle to cushion the ladder.
I ordered these to fit in a small guest room for extra sleeping space. I assembled them myself (one 60 year old woman) in a couple of hours with just a few mis-steps from the picture-only instructions from China. Not quite as heavy duty as I had hoped. When a full-size adult climbed the ladder to the top bunk, the bed felt as though it might try to pull over, but it did not lift off the ground.
This bed looks great, not difficult to put together, but two people are better than one. Be sure to read the directions through before you start, they are not very clear as to how to place the different rails. We do question the size of the  bottom bunk , it Is bigger than the 53-54 inches stated for a full size mattress. So the bottom mattress slides all over theplace. Can I use the box spring to help secure it?
Needed this for a guest bedroom that can be used for either youths or adults. This product came and was well packed. NO damages. It was fun to assemble (need two people though). I think it was a great value compared to purchasing it locally and having to transport it home. My only recommendation is that if you plan to use it for adults, anchor it to a corner wall so it doesn't sway or tweak when someone is on the top bunk. I did and all is good now.
Assembly took 4 hours. The main issue is the bottom bunk is big we have a newer full size mattress and it was too small. There is an extra 3 inches of metal hanging off the side. The bed is what it is cheap. It would be ok if the mattress actually fit.
I purchased this bed for about $190 with tax and Prime. It is well worth it for the money if you are looking for an inexpensive bunk bed for kids. The top supports up to 250 and bottom 300 pounds. My girls love it. My only complaint is that the instructions were horrible and it took me over 4 hours to assemble. I bought this because it was cheap and it seems like my children always ruin their furniture. Well worth the purchase if you don't mind the assembly.
But this product is strong as long as you use it to sleep on only.We also had some issues installing the guardrails as the screw alignments were off. But we managed to screw in 3/4 screws on each side so that it was somewhat safer. This price is a steal. ALSO! Make sure you buy the full mattress sold by Dorel Home Products as well. It fits perfectly on the bottom bunk and feels extremely comfortable (for a spring mattress).
I purchased this bed for my 16 and 19 year old boys who still have to share a room. The full size on the bottom was an approvement for my 6'4&#34;  son to spread out a little. He can have the bigger size without it and another bed side by side taking up all their room space.
Answer: You could most definitely fit a trundle underneath. I could fit my adult 5 ft 9" frame under there and my 7 year old hides underneath just for the fun of it.. Unfortunately I cannot help with the later part of your question, as I don't remember specific details of assembly. Hope this helps.