I have carried 2 bikes on the front of a 2003, K2500 Suburban.
Heads up, I had to fiddle with the bike rack to get the head lights to shine over the bike tires.
The bikes will add more tranny heat, about 2 to 3 degrees pan temp with 2 bikes on my setup. I had both a TC output line gage and a oil pan gage. In my case I would not want to carry more then 2 bikes due to the heat issue with the transmission. A buddy on his 2500 Burb was sweating bullets all the way home from GA to Ohio one summer as the 4 bikes blocked off too much cooling on his 8.1 V8 Burb.
Most 3/4 ton trucks have an actual tranny temp gage. Most 1/2 ton truck only have the warning it's too hot light. Do not know what you have, but heads up in the 2500 Suburban series, 2 is about all you want to haul up front.
See this post for more details complete with pic's and how I did the bike rack and where I bought it and the issue to overcome. I never did make it to adding the turn lights on the front, traded TV first. Now I will mount on front of TT tongue this summer.
Bike rack on front of 2500 Suburban
Hope this helps
John
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2004 Sunline T310SR
2005 Ford F350 Lariat, V10 with 4.10
CC, Short Bed. Integrated Brake Controller
Reese HP trunnion bar hitch with HP DC