I used to have a 94 Dodge Caravan years ago, i could haul just about anything in that old beast. I never put a trike in there but i did have dirt bikes, lawn mowers, and one small quad in there over the years. I put down a rolled rubber mat, a cheap one from Menards, after i was done i would roll that up toss it out and put the seats back in and haul the family like nothing happened.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....