I'm doing a lot of PPF and use VentureShield as well. Here's my 0.02¢:
Doing RV and such "non-traditional" large front-end vehicles is sometime easier when working with bulk roll and trimming by hand. When these large pieces are pre-cut, at that size it may be difficult to handle 'em, not to mention that if you're a rookie at applying this, you may turn is sweat in no time when figuring the cost of the part you're about to ruin. As for the trimming itself, all you need is a brand new blade (stainless steel prefered) and dexterity. You can practice on a table before going on the RV (for pressure). You might also consider that RVs, in opposite to cars, will not rust if you go too far so it's a great canvas for practice. VentureShield is a great products that also allow the installer to reposition the film many times as long as you keep it wet (see clips on Youtube for perfect mixing solutions).
Is it you 1st time on PPF?
About knifeless tape, I'm not sure it's suitable for that kinda material (let me guess...... NO) but I may be wrong (...) It's so thick and resistant (not soft as cast wrapping film) you'll probably get a big mess after trying to pull the wire from there, lifting your film everywhere and leaving marks / spots everywhere.
What's great with Venture is you don't need to cut through 100%. If you can adjust your hand pressure to allow, let say 85%, you'll be able to remove excess material as it will split naturally (you need to be really good to perform this kinda control however...)
Good Luck
BTW, these 2 were made "by hand" using 60" x 10ft single piece PP film