It's not just the strength of your bumper that you need to keep in mind; it seems many PUPs are not very stabel with the extra weight on the back! We discovered that a PO had welded a hitch & receiver to our PUP's frame, so we figured that we would be ok putting a couple of bikes on the back of the PUP. We even put a little extra weight (about 75#) in front of the PUP's axle to try and minimize any sway issues. In this photo you can see that our PUP generally has a lot of weight distributed toward the tongue due to how far back the axle is...but we were paranoid about those bikes (one adult bike and two kids' bikes). bike rack on the back by shizzknits, on Flickr We only went a about 10 miles from our house for our maiden voyage with the bikes on the back of the PUP and within 5 minutes of getting on the freeway I was ready to take them off! There was a lot of extra porpoising between the PUP and the back of the Funbus, plus we went around one curve and while there was no actual 'sway'....I did NOT like the way the PUP handled with the extra weight back there. And it definitely changed the way the Funbus drove as well. Keep in mind our PUP is very light: ~1500# loaded so if you had a heavier PUP (or beefier TV) it might work better. We are still looking at different ways to carry the bikes....I doubt we have room for the double receiver (plus I worry about the tongue weight as minivans tend to saggy butts when towing). We can't use any of the hatch mounted carriers due to the spoiler on the back of the van. So that leaves the top of the PUP or the top of the Funbus. Right now the top of the PUP looks to be the most likely place, though we are still trying to figure out how exactly we are going to mount some kind of rack system on the roof!