Well, I approved 載せ込む, so ....

Sense 1:
* http://www.geocities.jp/monkeyinmylife4/repo0206.html
(see the picture with the caption "みんなでよいしょと載せ込み中")
* http://d.hatena.ne.jp/letmerollit/20090406/p2
(see the pictures)
Sense 2:
not yet found in the wild, but inferred from the following iccurrences of 載せ込
む:
* 
http://kokkai.ndl.go.jp/SENTAKU/sangiin/145/0022/14506160022004a.html
* http://www.hitafuji.com/cgi-local/diarynew/diary.cgi?
mode=view&no=3775

NOTE: incomplete entry. Explanation: i can understand from a given context 
what this term means, but since i have not found it in any of the dictionaries i 
have access to, i have very cautiously offered English meanings, hoping 
(trusting) that others will expand this entry as needed (perhaps GG5 has 
something? i don't have that dictionary). For example, with sense 1 i suspect 
that colloquial terms like "piling up", "stuffing into", etc., could apply in some 
situations, as well... As regards sense 2, i am sure it is merely a matter of 
time before it will be found somewhere, since the verb form has been 
documented